Appendix B.

B.1 Default Values for all the Peripheral Control Registers

The default values for all of the peripheral control registers are shown in this appendix. 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 B-1. Default Values for all the Peripheral Control Registers 

Register Name	Mnemonic	I/O Address	R/W	Reset
Global Control/Status Register	GCSR	0x0	R/W	11000000
Real Time Clock Control Register	RTCCR	0x1	W	00000000
Real Time Clock Byte 0 Register	RTC0R	0x2	R/W	xxxxxxxx
Real Time Clock Byte 1 Register	RTC1R	0x3	R	xxxxxxxx
Real Time Clock Byte 2 Register	RTC2R	0x4	R	xxxxxxxx
Real Time Clock Byte 3 Register	RTC3R	0x5	R	xxxxxxxx
Real Time Clock Byte 4 Register	RTC4R	0x6	R	xxxxxxxx
Real Time Clock Byte 5 Register	RTC5R	0x7	R	xxxxxxxx
Watch-Dog Timer Control Register	WDTCR	0x8	W	00000000
Watch-Dog Timer Test Register	WDTTR	0x9	W	00000000
Global Output Control Register	GOCR	0xE	W	00000x00
Global Clock Double Register	GCDR	0xF	W	xxxxx000
MMU Instruction/Data Register	MMIDR	0x10	R/W	xxx00000
Stack Segment Register	STACKSEG (Z180 CBR)	0x11	R/W	00000000
Data Segment Register	DATASEG (Z180 BBR)	0x12	R/W	00000000
Segment Size Register	SEGSIZE (Z180 CBAR)	0x13	R/W	11111111
Memory Bank 0 Control Register	MB0CR	0x14	W	00000000
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
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	000x0000
Port A Data Register	PADR	0x30	R/W	xxxxxxxx
Port B Data Register	PBDR	0x40	R/W	xxxxxxxx
Port C Data Register	PCDR	0x50	R/W	x0x0x0x0
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	xxxxxxxx
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
I/O Bank 0 Control Register	IB0CR	0x80	W	00000xxx
I/O Bank 1 Control Register	IB1CR	0x81	W	00000xxx
I/O Bank 2 Control Register	IB2CR	0x82	W	00000xxx
I/O Bank 3 Control Register	IB3CR	0x83	W	00000xxx
I/O Bank 4 Control Register	IB4CR	0x84	W	00000xxx
I/O Bank 5 Control Register	IB5CR	0x85	W	00000xxx
I/O Bank 6 Control Register	IB6CR	0x86	W	00000xxx
I/O Bank 7 Control Register	IB7CR	0x87	W	00000xxx
Interrupt 0 Control Register	I0CR	0x98	W	xx000000
Interrupt 1 Control Register	I1CR	0x99	W	xx000000
Timer A Control/Status Register	TACSR	0xA0	R/W	0000xx00
Timer A Control Register	TACR	0xA2	W	0000xx00
Timer A Time Constant 1 Register	TAT1R	0xA3	W	xxxxxxxx
Timer A Time Constant 4 Register	TAT4R	0xA9	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	W	xxxxxxxx
Serial Port A Status Register	SASR	0xC3	R	0xx00000
Serial Port A Control Register	SACR	0xC4	W	xx000000
Serial Port B Data Register	SBDR	0xD0	R/W	xxxxxxxx
Serial Port B Address Register	SBAR	0xD1	W	xxxxxxxx
Serial Port B Status Register	SBSR	0xD3	R	0xx00000
Serial Port B Control Register	SBCR	0xD4	W	xx000000
Serial C Data Register	SCDR	0xE0	R/W	xxxxxxxx
Serial C Address Register	SCAR	0xE1	W	xxxxxxxx
Serial C Status Register	SCSR	0xE3	R	0xx00000
Serial C Control Register	SCCR	0xE4	W	xx00x000
Serial Port D Data Register	SDDR	0xF0	R/W	xxxxxxxx
Serial Port D Address Register	SDAR	0xF1	W	xxxxxxxx
Serial Port D Status Register	SDSR	0xF3	R	0xx00000
Serial Port D Control Register	SDCR	0xF4	W	xx00x000