M16C User Manual.pdf

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Programmable I/O PortMitsubishi microcomputers<strong>M16C</strong> / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTERProgrammable I/O PortsThere are 87 programmable I/O ports: P0 to P10 (excluding P85). Each port can be set independently forinput or output using the direction register. A pull-up resistance for each block of 4 ports can be set. P85 isan input-only port and has no built-in pull-up resistance.Figures 1.23.1 to 1.23.4 show the programmable I/O ports. Figure 1.23.5 shows the I/O pins.Each pin functions as a programmable I/O port and as the I/O for the built-in peripheral devices.To use the pins as the inputs for the built-in peripheral devices, set the direction register of each pin to inputmode. When the pins are used as the outputs for the built-in peripheral devices (other than the D-A converter),they function as outputs regardless of the contents of the direction registers. When pins are to beused as the outputs for the D-A converter, do not set the direction registers to output mode. See thedescriptions of the respective functions for how to set up the built-in peripheral devices.(1) Direction registersFigure 1.23.6 shows the direction registers.These registers are used to choose the direction of the programmable I/O ports. Each bit in these registerscorresponds one for one to each I/O pin.Note: There is no direction register bit for P85.(2) Port registersFigure 1.23.7 shows the port registers.These registers are used to write and read data for input and output to and from an external device. Aport register consists of a port latch to hold output data and a circuit to read the status of a pin. Each bitin port registers corresponds one for one to each I/O pin.(3) Pull-up control registersFigure 1.23.8 shows the pull-up control registers.The pull-up control register can be set to apply a pull-up resistance to each block of 4 ports. When portsare set to have a pull-up resistance, the pull-up resistance is connected only when the direction register isset for input.However, in memory expansion mode and microprocessor mode, the pull-up control register of P0 to P3,P40 to P43, and P5 is invalid.(4) Port control registerFigure 1.23.9 shows the port control register.The bit 0 of port control resister is used to read port P1 as follows:0 : When port P1 is input port, port input level is read.When port P1 is output port , the contents of port P1 register is read.1 : The contents of port P1 register is read always.This register is valid in the following:• External bus width is 8 bits in microprocessor mode or memory expansion mode.• Port P1 can be used as a port in multiplexed bus for the entire space.167
Programmable I/O PortMitsubishi microcomputers<strong>M16C</strong> / 62 GroupSINGLE-CHIP 16-BIT CMOS MICROCOMPUTERP00 to P07, P20 to P27,P30 to P37, P40 to P47,P50 to P54, P56Data busPull-up selectionDirection registerPort latch(Note)Pull-up selectionP10 to P14Direction registerPort P1 control registerData busPort latch(Note)Pull-up selectionP15 to P17Direction registerPort P1 control registerData busPort latch(Note)Input to respective peripheral functionsPull-up selectionP57, P60, P61, P64, P65,P72 to P76, P80, P81,P90, P92Data busDirection registerPort latch"1"Output(Note)Input to respective peripheral functionsNote :1symbolizes a parasitic diode.Do not apply a voltage higher than Vcc to each port.Figure 1.23.1. Programmable I/O ports (1)168
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To all our customersRegarding the c
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Keep safety first in your circuit d
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This manual comprises of eight chap
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Table of ContentsChapter 1 Hardware
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2.5 Clock-Asynchronous Serial I/O (
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4.2.1 Interrupt Enable Flag .......
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Quick Reference to Pages Classified
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Quick Reference to Pages Classified
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DescriptionMitsubishi microcomputer
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Pin DescriptionMitsubishi microcomp
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CPUMitsubishi microcomputersM16C /
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CPUMitsubishi microcomputersM16C /
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ResetMitsubishi microcomputersM16C
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ResetMitsubishi microcomputersM16C
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SFRMitsubishi microcomputersM16C /
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Memory Space Expansion FunctionsMit
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Software ResetMitsubishi microcompu
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Processor ModeMitsubishi microcompu
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Bus SettingsMitsubishi microcompute
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Specified address rangeBus ControlM
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Bus ControlMitsubishi microcomputer
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Clock Generating CircuitMitsubishi
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Clock Generating CircuitMitsubishi
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Wait ModeMitsubishi microcomputersM
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Power controlMitsubishi microcomput
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ProtectionMitsubishi microcomputers
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InterruptMitsubishi microcomputersM
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Address Match InterruptMitsubishi m
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Precautions for InterruptsMitsubish
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Watchdog TimerMitsubishi microcompu
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DMACMitsubishi microcomputersM16C /
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TimerMitsubishi microcomputersM16C
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Timer AMitsubishi microcomputersM16
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Timer BMitsubishi microcomputersM16
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Timers’ functions for three-phase
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Serial I/OMitsubishi microcomputers
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Page 145 and 146: Clock asynchronous serial I/O (UART
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Page 169 and 170: A-D ConverterMitsubishi microcomput
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Page 185 and 186: Programmable I/O PortMitsubishi mic
Page 193 and 194: Usage precautionMitsubishi microcom
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Page 197 and 198: Electrical characteristicsMitsubish
Page 199 and 200: Electrical characteristics (Vcc = 5
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Page 209 and 210: Timing (Vcc = 5V)Mitsubishi microco
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Page 229 and 230: IssuancesignatureReceiptMitsubishi
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IssuancesignatureReceiptMitsubishi
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Description (Flash Memory Version)M
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CPU Rewrite Mode (Flash Memory Vers
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Functions To Inhibit Rewriting (Fla
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Appendix Parallel I/O Mode (Flash M
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Appendix Standard Serial I/O Mode (
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ProtectMitsubishi microcomputersM16
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ProtectMitsubishi microcomputersM16
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Counter content (hex)Timer AMitsubi
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Counter content (hex)Timer BMitsubi
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Counter content (hex)Timer BMitsubi
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UARTMitsubishi microcomputersM16C /
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SIM interfaceMitsubishi microcomput
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SI/O3, 4Mitsubishi microcomputersM1
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SI/O3, 4Mitsubishi microcomputersM1
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A-D ConverterMitsubishi microcomput
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Converted analog input pinConverted
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D-A ConverterMitsubishi microcomput
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CRC Calculation CircuitMitsubishi m
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Key-Input InterruptMitsubishi micro
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Key-Input InterruptMitsubishi micro
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Power ControlMitsubishi microcomput
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ApplicationsMitsubishi microcompute
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Timer A1 countercontent (hex)Timer
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Timer A ApplicationsMitsubishi micr
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DMAC ApplicationsMitsubishi microco
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DMAC ApplicationsMitsubishi microco
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Controlling Power ApplicationsMitsu
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External BusesMitsubishi microcompu
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External ROMMitsubishi microcompute
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Standard CharacteristicsMitsubishi
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Absolute error [LSB]Standard Charac
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Absolute accuracy [mV]Absolute accu
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Appendix 1Mitsubishi microcomputers
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Appendix 2 Hexadecimal instruction
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Appendix 3 Setting register for pin
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MITSUBISHI Single-Chip Microcompute
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