6. Rabbit Internal I/O Registers

Table 6-1. Rabbit 3000 Peripherals and Interrupt Service Vectors 

On-Chip Peripheral	ISR Starting Address
System Management	{IIR, 00h}
Memory Management	No interrupts
Slave Port	{IIR, 80h}
Parallel Port A	No interrupts
Parallel Port F	No interrupts
Parallel Port B	No interrupts
Parallel Port G	No interrupts
Parallel Port C	No interrupts
Input Capture	{IIR[7:1], 1, A0h}
Parallel Port D	No interrupts
Parallel Port E	No interrupts
External I/O Control	No interrupts
Pulse Width Modulator	No interrupts
Quadrature Decoder	{IIR[7:1], 1, 90h}
External Interrupts	INT0 {EIR, 00h} INT1 {EIR, 10h}
Timer A	{IIR, A0h}
Timer B	{IIR, B0h}
Serial Port A (async/cks)	{IIR, C0h}
Serial Port E (async/hdlc)	{IIR[7:1], 1, C0h}
Serial Port B (async/cks)	{IIR, D0h}
Serial Port F (async/hdlc)	{IIR[7:1], 1, D0h}
Serial Port C (async/cks)	{IIR, E0h}
Serial Port D (async/cks)	{IIR, F0h}
RST 10 instruction	{IIR, 20h}
RST 18 instruction	{IIR, 30h}
RST 20 instruction	{IIR, 40h}
RST 28 instruction	{IIR, 50h}
RST 38 instruction	{IIR, 60h}

6.1 Default Values for all the Peripheral Control Registers

The default values for all of the peripheral control registers are shown in Table 6-2. The registers within the CPU affected by reset are the Stack Pointer (SP), the Program Counter (PC), the IIR register, the EIR register, and the IP register. The IP register is set to all ones (disabling all interrupts), while all of the other listed CPU registers are reset to all zeros.

Table 6-2. Rabbit Internal I/O Registers 

Register Name	Mnemonic	I/O Address	R/W	Reset
Global Control/Status Register	GCSR	0x00	R/W	11000000
Global Clock Modulator 0 Register	GCM0R	0x0A	W	00000000
Global Clock Modulator 1 Register	GCM1R	0x0B	W	00000000
Global Clock Double Register	GCDR	0x0F	W	00000000
Breakpoint/Debug Control Register	BDCR	0x0C	W	0xxxxxxx
Global Power Save Control Register	GPSCR	0x0D	W	0000x000
Global Output Control Register	GOCR	0x0E	W	00000000
MMU Instruction/Data Register	MMIDR	0x10	R/W	00000000
MMU Common Base Register	STACKSEG	0x11	R/W	00000000
MMU Bank Base Register	DATASEG	0x12	R/W	00000000
MMU Common Bank Area Register	SEGSIZE	0x13	R/W	11111111
Memory Bank 0 Control Register	MB0CR	0x14	W	00001000
Memory Bank 1 Control Register	MB1CR	0x15	W	xxxxxxxx
Memory Bank 2 Control Register	MB2CR	0x16	W	xxxxxxxx
Memory Bank 3 Control Register	MB3CR	0x17	W	xxxxxxxx
MMU Expanded Code Register	MECR	0x18	R/W	xxxxx000
Memory Timing Control Register	MTCR	0x19	W	xxxx0000
Slave Port Data 0 Register	SPD0R	0x20	R/W	xxxxxxxx
Slave Port Data 1 Register	SPD1R	0x21	R/W	xxxxxxxx
Slave Port Data 2 Register	SPD2R	0x22	R/W	xxxxxxxx
Slave Port Status Register	SPSR	0x23	R	00000000
Slave Port Control Register	SPCR	0x24	R/W	0xx00000
Global ROM Configuration Register	GROM	0x2C	R	0xx00000
Global RAM Configuration Register	GRAM	0x2D	R	0xx00000
Global CPU Configuration Register	GCPU	0x2E	R	0xx00001
Global Revision Register	GREV	0x2F	R	0xx00000
Port A Data Register	PADR	0x30	R/W	xxxxxxxx
Port B Data Register	PBDR	0x40	R/W	00xxxxxx
Port B Data Direction Register	PBDDR	0x47	W	11000000
Port C Data Register	PCDR	0x50	R/W	x0x1x1x1
Port C Function Register	PCFR	0x55	W	x0x0x0x0
Port D Data Register	PDDR	0x60	R/W	xxxxxxxx
Port D Control Register	PDCR	0x64	W	xx00xx00
Port D Function Register	PDFR	0x65	W	xxxxxxxx
Port D Drive Control Register	PDDCR	0x66	W	xxxxxxxx
Port D Data Direction Register	PDDDR	0x67	W	00000000
Port D Bit 0 Register	PDB0R	0x68	W	xxxxxxxx
Port D Bit 1 Register	PDB1R	0x69	W	xxxxxxxx
Port D Bit 2 Register	PDB2R	0x6A	W	xxxxxxxx
Port D Bit 3 Register	PDB3R	0x6B	W	xxxxxxxx
Port D Bit 4 Register	PDB4R	0x6C	W	xxxxxxxx
Port D Bit 5 Register	PDB5R	0x6D	W	xxxxxxxx
Port D Bit 6 Register	PDB6R	0x6E	W	xxxxxxxx
Port D Bit 7 Register	PDB7R	0x6F	W	xxxxxxxx
Port E Data Register	PEDR	0x70	R/W	xxxxxxxx
Port E Control Register	PECR	0x74	W	xx00xx00
Port E Function Register	PEFR	0x75	W	00000000
Port E Data Direction Register	PEDDR	0x77	W	00000000
Port E Bit 0 Register	PEB0R	0x78	W	xxxxxxxx
Port E Bit 1 Register	PEB1R	0x79	W	xxxxxxxx
Port E Bit 2 Register	PEB2R	0x7A	W	xxxxxxxx
Port E Bit 3 Register	PEB3R	0x7B	W	xxxxxxxx
Port E Bit 4 Register	PEB4R	0x7C	W	xxxxxxxx
Port E Bit 5 Register	PEB5R	0x7D	W	xxxxxxxx
Port E Bit 6 Register	PEB6R	0x7E	W	xxxxxxxx
Port E Bit 7 Register	PEB7R	0x7F	W	xxxxxxxx
Port F Data Register	PFDR	0x38	R/W	xxxxxxxx
Port F Control Register	PFCR	0x3C	W	xx00xx00
Port F Function Register	PFFR	0x3D	W	xxxxxxxx
Port F Drive Control Register	PFDCR	0x3E	W	xxxxxxxx
Port F Data Direction Register	PFDDR	0x3F	W	00000000
Port G Data Register	PGDR	0x48	R/W	xxxxxxxx
Port G Control Register	PGCR	0x4C	W	xx00xx00
Port G Function Register	PGFR	0x4D	W	xxxxxxxx
Port G Drive Control Register	PGDCR	0x4E	W	xxxxxxxx
Port G Data Direction Register	PGDDR	0x4F	W	00000000
Input Capture Ctrl/Status Register	ICCSR	0x56	R/W	00000000
Input Capture Control Register	ICCR	0x57	W	xxxxxx00
Input Capture Trigger 1 Register	ICT1R	0x58	W	00000000
Input Capture Source 1 Register	ICS1R	0x59	W	xxxxxxxx
Input Capture LSB 1 Register	ICL1R	0x5A	R	xxxxxxxx
Input Capture MSB 1 Register	ICM1R	0x5B	R	xxxxxxxx
Input Capture Trigger 2 Register	ICT2R	0x5C	W	00000000
Input Capture Source 2 Register	ICS2R	0x5D	W	xxxxxxxx
Input Capture LSB 2 Register	ICL2R	0x5E	R	xxxxxxxx
Input Capture MSB 2 Register	ICM2R	0x5F	R	xxxxxxxx
I/O Bank 0 Control Register	IB0CR	0x80	W	000000xx
I/O Bank 1 Control Register	IB1CR	0x81	W	000000xx
I/O Bank 2 Control Register	IB2CR	0x82	W	000000xx
I/O Bank 3 Control Register	IB3CR	0x83	W	000000xx
I/O Bank 4 Control Register	IB4CR	0x84	W	000000xx
I/O Bank 5 Control Register	IB5CR	0x85	W	000000xx
I/O Bank 6 Control Register	IB6CR	0x86	W	000000xx
I/O Bank 7 Control Register	IB7CR	0x87	W	000000xx
PWM LSB 0 Register	PWL0R	0x88	W	xxxxxxxx
PWM MSB 0 Register	PWM0R	0x89	W	xxxxxxxx
PWM LSB 1 Register	PWL1R	0x8A	W	xxxxxxxx
PWM MSB 1 Register	PWM1R	0x8B	W	xxxxxxxx
PWM LSB 2 Register	PWL2R	0x8C	W	xxxxxxxx
PWM MSB 2 Register	PWM2R	0x8D	W	xxxxxxxx
PWM LSB 3 Register	PWL3R	0x8E	W	xxxxxxxx
PWM MSB 3 Register	PWM3R	0x8F	W	xxxxxxxx
Quad Decode Ctrl/Status Register	QDCSR	0x90	R/W	xxxxxxxx
Quad Decode Control Register	QDCR	0x91	W	00xx0000
Quad Decode Count 1 Register	QDC1R	0x94	R	xxxxxxxx
Quad Decode Count 2 Register	QDC2R	0x96	R	xxxxxxxx
Interrupt 0 Control Register	I0CR	0x98	W	xx000000
Interrupt 1 Control Register	I1CR	0x99	W	xx000000
Real Time Clock Control Register	RTCCR	0x01	W	00000000
Real Time Clock Byte 0 Register	RTC0R	0x02	R/W	xxxxxxxx
Real Time Clock Byte 1 Register	RTC1R	0x03	R	xxxxxxxx
Real Time Clock Byte 2 Register	RTC2R	0x04	R	xxxxxxxx
Real Time Clock Byte 3 Register	RTC3R	0x05	R	xxxxxxxx
Real Time Clock Byte 4 Register	RTC4R	0x06	R	xxxxxxxx
Real Time Clock Byte 5 Register	RTC5R	0x07	R	xxxxxxxx
Timer A Control/Status Register	TACSR	0xA0	R/W	00000000
Timer A Prescale Register	TAPR	0xA1	W	xxxxxxx1
Timer A Time Constant 1 Register	TAT1R	0xA3	W	xxxxxxxx
Timer A Control Register	TACR	0xA4	W	00000000
Timer A Time Constant 2 Register	TAT2R	0xA5	W	xxxxxxxx
Timer A Time Constant 8 Register	TAT8R	0xA6	W	xxxxxxxx
Timer A Time Constant 3 Register	TAT3R	0xA7	W	xxxxxxxx
Timer A Time Constant 9 Register	TAT9R	0xA8	W	xxxxxxxx
Timer A Time Constant 4 Register	TAT4R	0xA9	W	xxxxxxxx
Timer A Time Constant 10 Register	TAT10R	0xAA	W	xxxxxxxx
Timer A Time Constant 5 Register	TAT5R	0xAB	W	xxxxxxxx
Timer A Time Constant 6 Register	TAT6R	0xAD	W	xxxxxxxx
Timer A Time Constant 7 Register	TAT7R	0xAF	W	xxxxxxxx
Timer B Control/Status Register	TBCSR	0xB0	R/W	xxxxx000
Timer B Control Register	TBCR	0xB1	W	xxxx0000
Timer B MSB 1 Register	TBM1R	0xB2	W	xxxxxxxx
Timer B LSB 1 Register	TBL1R	0xB3	W	xxxxxxxx
Timer B MSB 2 Register	TBM2R	0xB4	W	xxxxxxxx
Timer B LSB 2 Register	TBL2R	0xB5	W	xxxxxxxx
Timer B Count MSB Register	TBCMR	0xBE	R	xxxxxxxx
Timer B Count LSB Register	TBCLR	0xBF	R	xxxxxxxx
Serial Port A Data Register	SADR	0xC0	R/W	xxxxxxxx
Serial Port A Address Register	SAAR	0xC1	R/W	xxxxxxxx
Serial Port A Long Stop Register	SALR	0xC2	R/W	xxxxxxxx
Serial Port A Status Register	SASR	0xC3	R	0xx00000
Serial Port A Control Register	SACR	0xC4	W	xx000000
Serial Port A Extended Register	SAER	0xC5	W	00000000
Serial Port B Data Register	SBDR	0xD0	R/W	xxxxxxxx
Serial Port B Address Register	SBAR	0xD1	R/W	xxxxxxxx
Serial Port B Long Stop Register	SBLR	0xD2	R/W	xxxxxxxx
Serial Port B Status Register	SBSR	0xD3	R	0xx00000
Serial Port B Control Register	SBCR	0xD4	W	xx000000
Serial Port B Extended Register	SBER	0xD5	W	00000000
Serial Port C Data Register	SCDR	0xE0	R/W	xxxxxxxx
Serial Port C Address Register	SCAR	0xE1	R/W	xxxxxxxx
Serial Port C Long Stop Register	SCLR	0xE2	R/W	xxxxxxxx
Serial Port C Status Register	SCSR	0xE3	R	0xx00000
Serial Port C Control Register	SCCR	0xE4	W	xx000000
Serial Port C Extended Register	SCER	0xE5	W	00000000
Serial Port D Data Register	SDDR	0xF0	R/W	xxxxxxxx
Serial Port D Address Register	SDAR	0xF1	R/W	xxxxxxxx
Serial Port D Long Stop Register	SDLR	0xF2	R/W	xxxxxxxx
Serial Port D Status Register	SDSR	0xF3	R	0xx00000
Serial Port D Control Register	SDCR	0xF4	W	xx000000
Serial Port D Extended Register	SDER	0xF5	W	00000000
Serial Port E Data Register	SEDR	0xC8	R/W	xxxxxxxx
Serial Port E Address Register	SEAR	0xC9	R/W	xxxxxxxx
Serial Port E Long Stop Register	SELR	0xCA	R/W	xxxxxxxx
Serial Port E Status Register	SESR	0xCB	R	0xx00000
Serial Port E Control Register	SECR	0xCC	W	xx000000
Serial Port E Extended Register	SEER	0xCD	W	000x000x
Serial Port F Data Register	SFDR	0xD8	R/W	xxxxxxxx