Rabbit 4000 Microprocessor User's Manual

Appendix A. Parallel Port Pins with Alternate Functions

A.1 Alternate Parallel Port Pin Outputs

Table A-1. Alternate Parallel Port A and B Pin Outputs 

Pin	Alternate Output Options
	Serial Clock	I/O Mode	Slave Mode
PA[7:0]	—	Data	—
PB7	—	IA5	/SLVATN
PB6	—	IA4	—
PB5	—	IA3	—
PB4	—	IA2	—
PB3	—	IA1	—
PB2	—	IA0	—
PB1	SCLKA	IA7	—
PB0	SCLKB	IA6	—

Table A-2. Alternate Parallel Port C, D, and E Pin Outputs 

Pin	Alternate Output Option
	0	1	2	3	16-bit Data
PC7	TXA	I7	PWM3	SCLKC	—
PC6	TXA	I6	PWM2	TXE	—
PC5	TXB	I5	PWM1	RCLKE	—
PC4	TXB	I4	PWM0	TCLKE	—
PC3	TXC	I3	TIMER C3	SCLKD	—
PC2	TXC	I2	TIMER C2	TXF	—
PC1	TXD	I1	TIMER C1	RCLKF	—
PC0	TXD	I0	TIMER C0	TCLKF	—
PD7	IA7	I7	PWM3	SCLKC	D15
PD6	TXA	I6	PWM2	TXE	D14
PD5	IA6	I5	PWM1	RCLKE	D13
PD4	TXB	I4	PWM0	TCLKE	D12
PD3	IA7	I3	TIMER C3	SCLKD	D11
PD2	SCLKC1.	I2	TIMER C2	TXF	D10
PD1	IA6	I1	TIMER C1	RCLKF	D9
PD0	SCLKD2.	I0	TIMER C0	TCLKF	D8
PE7	I7	/ACT	PWM3	SCLKC	—
PE6	I6	—	PWM2	TXE	—
PE5	I5	/LINK	PWM1	RCLKE	—
PE4	I4	/A0	PWM0	TCLKE	—
PE3	I3	A23	TIMER C3	SCLKD	—
PE2	I2	A22	TIMER C2	TXF	—
PE1	I1	A21	TIMER C1	RCLKF	—
PE0	I0	A20	TIMER C0	TCLKF	—

* When Serial Port C is enabled in the clocked serial mode with an internal clock, PD2 becomes SCLKC and is not available for other use. However, all the Parallel Port D pins are used for the 16-bit data bus, and so a pin on another parallel port then has to be selected for the clock output. * When Serial Port D is enabled in the clocked serial mode with an internal clock, PD0 becomes SCLKD and is not available for other use. However, all the Parallel Port D pins are used for the 16-bit data bus, and so a pin on another parallel port then has to be selected for the clock output

A.2 Alternate Parallel Port Pin Inputs

Table A-3. Alternate Parallel Port Pin Inputs 

Pin	Input Capture	DMA	External Interrupt	I/O Hand- shake	Network	Quad- rature Decoder	Slave Port	Serial Ports A–D	Serial Ports E–F
PA[7:0]	—	—	—	—	—		Data	—	—
PB7	—	—	—	—	—	—		—	—
PB6	—	—	—	—	—	—	/SCS	—	—
PB5	—	—	—	—	—	—	SA1	—	—
PB4	—	—	—	—	—	—	SA0	—	—
PB3	—	—	—	—	—	—	/SRD	—	—
PB2	—	—	—	—	—	—	/SWR	—	—
PB1	—	—	—	—	—	—	—	SCLKA	—
PB0	—	—	—	—	—	—	—	SCLKB	—
PC7	Yes	—	—	—	—	—	—	RXA	RXE
PC6	—	—	—	—	—	—	—	—	—
PC5	Yes	—	—	—	—	—	—	RXB	RCLKE
PC4	—	—	—	—	—	—	—	—	TCLKE
PC3	Yes	—	—	—	—	—	—	RXC	RXF
PC2	—	—	—	—	—	—	—	—	—
PC1	Yes	—	—	—	—	—	—	RXD	RCLKF
PC0	—	—	—	—	—	—	—	—	TCLKF
PD7	Yes	—	—	—	—	—	—	RXA	RXE
PD6	—	—	—	—	—	—	—	—	—
PD5	Yes	—	—	—	—	—	—	RXB	RCLKE
PD4	—	—	—	—	—	—	—	—	TCLKE
PD3	Yes	DREQ1	—	—	—	QRD2A	—	RXC	RXF
PD2	—	DREQ0	—	—	—	QRD2B	—	SCLKC	—
PD1	Yes	—	INT1	—	—	QRD1A	—	RXD	RCLKF
PD0	—	—	INT0	—	—	QRD1B	—	SCLKD	TCLKF
PE7	Yes	DREQ1	—	Yes	—	QRD2A	/SCS	RXA	RXE
PE6	—	DREQ0	—	Yes	ECLK	QRD2B	—	—	—
PE5	Yes	—	INT1	Yes	—	QRD1A	—	RXB	RCLKE
PE4	—	—	INT0	Yes	—	QRD1B	—	—	TCLKE
PE3	Yes	DREQ1	—	Yes	—	QRD2A	—	RXC	RXF
PE2	—	DREQ0	—	Yes	—	QRD2B	—	SCLKC	—
PE1	Yes		INT1	Yes	—	QRD1A	—	RXD	RCLKF
PE0	—		INT0	Yes	—	QRD1B	—	SCLKD	TCLKF