MC80F7708 - abov.co.kr

MC80F77089.2 I/O Ports ConfigurationR0 PortR0 is a 4-bit CMOS bidirectional I/O port (address 0C0 H ).Each I/O pin can independently used as an input or an outputthrough the R0IO register (address 0C1 H ).R0 has internal pull-ups that is independently connected ordisconnected by R0PU. The control registers for R0 areshown below.In addition, Port R0 is multiplexed with various specialfeatures. The control register PSR0 (address 0AA H ) controlsthe selection of alternate function. After reset, thisvalue is “0”, port may be used as normal I/O port.To use alternate function such as External Interrupt ratherthan normal I/O, write “1” in the corresponding bit ofPSR0.Port PinR01--R04R06R07Alternate FunctionEC0 (Timer0 Event Input)TX0 (TX0 Output)RX0 (RX0 Input)BUZO (Buzzer Output)INT0 (External Interrupt 0)INT1 (External Interrupt 1)Note: R0IO, R0PU, P0OD and PSR0 are write-only registers.They can not be read and can not be accessed by bitmanipulation instruction. Do not use read or read-modifywriteinstruction. Use byte manipulation instruction.R0 Data RegisterR0ADDRESS : 0C0 HRESET VALUE : 00-0--0- BR07 R06 - R04 - - R01 -R0 Direction RegisterR0IOR0 Pull-upSelection RegisterR0PUR0 Open DrainSelection RegisterR0ODPortSelection Register 0PSR0ADDRESS : 0C1 HRESET VALUE : 00-0--0- B- - - -Port Direction0: Input1: OutputADDRESS :0A5 HRESET VALUE : 00-0--0- B- - --Pull-up select0: Without pull-up1: With pull-upADDRESS :0A0 HRESET VALUE : 00-0--0- B- - - -Open Drain select0: No Open Drain1: Open DrainADDRESS :0AA HRESET VALUE : 00-0000- BINT1I INT0I - BUZO RX0I TX0O EC0I -R1 PortsR1 is an 1-bit CMOS bidirectional I/O port (address0C2 H ). Each I/O pin can independently used as an input oran output through the R1IO register (address 0C3 H ).R1 has internal pull-up that is independently connected ordisconnected by register R1PU. The control registers forR1 are shown below.Port R1 is multiplexed with two special features. The controlregister controls the selection of alternate function. Afterreset, this value is “0”, port may be used as normal I/Oport. The way to select alternate function such as PWM1or Timer Output Wave will be shown in each peripheralsection.Note: R1IO, R1PU, P1OD and PSR1 are write-only registers.They can not be read and can not be accessed by bitmanipulation instruction. Do not use read or read-modifywriteinstruction. Use byte manipulation instruction.INT1I (External Interrupt 1)0: R07 Port1: INT1BUZO (Buzzer Output)0: R04 Port1: BUZOTX0O (TX0 Output)0: -1: TX0INT0I (External Interrupt 0)0: R06 Port1: INT0RX0I (RX0 Input)0: -1: RX0EC0I (Timer0 Event Input)0: R01 Port1: EC036 December 3, 2012 Ver 1.21