RL78/D1A User's Manual: Hardware - Renesas

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Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 4 PORT FUNCTIONS 4.2.4 Port 3 Port 3 is an 8-bit I/O port with an output latch. Port 3 can be set to the input mode or output mode in 1-bit units using port mode register 3 (PM3). When the P30 to P37 pins are used as an input port, use of an on-chip pull-up resistor can be specified in 1-bit units by pull-up resistor option register 3 (PU3). Input to the P31 pin can be specified through a normal Schmitt3 input buffer or a Schmitt1 input buffer using port input mode register 3 (PIM3). Output from the P30 and P31 pins can be specified as normal CMOS output or N-ch open-drain output (VDD tolerance) in 1-bit units, using port output mode register (POM). These pins also function as timer I/O, serial interface data I/O, and segment signal outputs for the LCD controller/driver. To use P30 to P37 as the port function, refer Table 4-5. P30 to P37 Pins LCDPF3 Alternate function port function P30 P31 P32 P33 P34 P35 P36 P37 Table 4-5. Setting of P30 to P37 Pins to port function Register Timer Serial R01UH0317EJ0004 Rev. 0.04 161 Feb. 22, 2013 PM3 Register PIM3 Register POM Register Remarks Input port Digital I/O - - Input mode N/A - Output port selection 0 1 Output mode 0 CMOS output Input port Digital I/O selection - - Input mode Output port 0 1 Output mode - Input port Digital I/O - - Input mode Output port selection 0 1 Output mode Input port Digital I/O - N/A Input mode Output port selection 0 Output mode Input port Digital I/O - - Input mode Output port selection 0 1 Output mode Input port Digital I/O - N/A Input mode Output port selection 0 Output mode Input port Digital I/O - N/A Input mode Output port selection 0 Output mode Input port Digital I/O - N/A Input mode Output port selection 0 Output mode - - LCD Segment output selection Reset signal generation sets port 3 to input mode. Figures 4-13 to 4-16 show block diagrams of port3. 1 N-ch OD output 0 Schmitt1 input 1 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Schmitt3 input 0 CMOS output 1 N-ch OD output - - - - - LCD segment output
Under development Preliminary document Specifications in this document are tentative and subject to change. RL78/D1A CHAPTER 4 PORT FUNCTIONS Internal bus WRPU RD WRPORT WRPM WRPOM WRLCDPF Figure 4-13. Block Diagram of P30 PU3 PU30 Alternate function P3 Output latch (P30) PM3 PM30 Alternate function (TO20) POM POM_2 Alternate function (SCL11) LCDPF3 Selector LCD controller/driver PF30 P3: Port register 3 PU3: Pull-up resistor option register 3 PM3: Port mode register 3 LCDPF3: LCD port function registers 3 POM: Port Output mode register RD: Read signal WRxx: Write signal P30/TI20/TO20/ SCL11/SEG6 Caution When using the alternate function TO20, set the port latch to 0. When using the alternate function SCL11, set the port latch to 1. When using P30 as a general-purpose port, specify the port settings so that the alternate function outputs are fixed (Timer to 0 and Serial to 1). R01UH0317EJ0004 Rev. 0.04 162 Feb. 22, 2013 Selector EVDD P-ch
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User’s Manual 16 RL78/D1A 16-Bit
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NOTES FOR CMOS DEVICES (1) VOLTAGE
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Conventions Data significance: High
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CONTENTS CHAPTER 1 OUTLINE.........
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3.4.4 Short direct addressing .....
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6.8 Operation of Plural Channels of
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