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Introduction
On-chip registers
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ON-CHIP REGISTERS

These are memory locations used inside the H8/532 microprocessor chip. Full details on how they are used can be found in Hardware Manual, appendix B. For example, to configure one of the spare parallel ports (Port 7) for input on bits 0-3 and output on bits 4-7 type $F0 $FF8C C! . This writes data hex F0 to address FF8C, the data direction register for the port.

 

NOTES

q       The last column shows data initialised at reset by either the microprocessor chip hardware or the Forth system.

q       R=Read only register W=Write only register (data read back will be meaningless)

q       R/W=Read/Write register. Some bits are exceptions to the Read/Write capability shown. See Hardware Manual.

I/O Ports

Addr.

Register

Abbr.

R/W

Init.

FF80

Port 1 Data Direction Register

P1DDR

W

0E

FF82

Port 1 Data Register

P1DR

R/W

06

FF8C

Port 7 Data Direction Register

P7DDR

W

00

FF8E

Port 7 Data Register

P7DR

R/W

00

FF8F

Port 8 Data Register

P8DR

R

-

FFFC

Port 1 Control Register

P1CR

R/W

87

FFFE

Port 9 Data Direction Register

P9DDR

W

21

FFFF

Port 9 Data Register

P9DR

R/W

21

Free Running Timer 1   FRT1

Addr.

Register

Abbr.

R/W

Init.

FF90

Timer Control Register

TCR

R/W

00

FF91

Timer Control/Status Register

TCSR

R/W

00

FF92/FF93

Free Running Counter

FRC

R/W

00

FF94/FF95

Output Compare Register A

OCRA

R/W

FF

FF96/FF97

Output Compare Register B

OCRB

R/W

FF

FF98/FF99

Input Capture Register

ICR

R

00

Free Running Timer 2   FRT2

Addr.

Register

Abbr.

R/W

Init.

FFA0

Timer Control Register

TCR

R/W

00

FFA1

Timer Control/Status Register

TCSR

R/W

00

FFA2/FFA3

Free Running Counter

FRC

R/W

00

FFA4/FFA5

Output Compare Register A

OCRA

R/W

FF

FFA6/FFA7

Output Compare Register B

OCRB

R/W

FF

FFA8/FFA9

Input Capture Register

ICR

R

00

Free Running Timer 3   FRT3

Addr.

Register

Abbr.

R/W

Init.

FFB0

Timer Control Register

TCR

R/W

00

FFB1

Timer Control/Status Register

TCSR

R/W

00

FFB2/FFB3

Free Running Counter

FRC

R/W

00

FFB4/FFB5

Output Compare Register A

OCRA

R/W

FF

FFB6/FFB7

Output Compare Register B

OCRB

R/W

FF

FFB8/FFB9

Input Capture Register

ICR

R

00

D to A Converter 1   PWM1

Addr.

Register

Abbr.

R/W

Init.

FFC0

Timer Control Register

TCR

R/W

38

FFC1

Duty Register

DTR

R/W

FF

FFC2

Timer Counter

TCNT

R

00

D to A Converter 2   PWM2

Addr.

Register

Abbr.

R/W

Init.

FFC4

Timer Control Register

TCR

R/W

38

FFC5

Duty Register

DTR

R/W

FF

FFC6

Timer Counter

TCNT

R

00

D to A Converter 3   PWM3

Addr.

Register

Abbr.

R/W

Init.

FFC8

Timer Control Register

TCR

R/W

38

FFC9

Duty Register

DTR

R/W

FF

FFCA

Timer Counter

TCNT

R

00

8-bit Timer   TMR

Addr.

Register

Abbr.

R/W

Init.

FFD0

Timer Control Register

TCR

R/W

00

FFD1

Timer Control/Status Register

TCSR

R/W

10

FFD2

Timer Constant Register A

TCORA

R/W

FF

FFD3

Timer Constant Register B

TCORB

R/W

FF

FFD4

Timer Counter

TCNT

R/W

00

Serial Communications   SCI

Addr.

Register

Abbr.

R/W

Init.

FFD8

Serial Mode Register

SMR

R/W

04

FFD9

Bit Rate Register

BRR

R/W

FF

FFDA

Serial Control Register

SCR

R/W

0C

FFDB

Transmit Data Register

TDR

R/W

FF

FFDC

Serial Status Register

SSR

R

87

FFDD

Receive Data Register

RDR

R

00

Analog to Digital Converter   A/D

Addr.

Register

Abbr.

R/W

Init.

FFE0/FFE1

A/D Data Register A

ADDRA

R

00

FFE2/FFE3

A/D Data Register B

ADDRB

R

00

FFE4/FFE5

A/D Data Register C

ADDRC

R

00

FFE6/FFE7

A/D Data Register D

ADDRD

R

00

FFE8

A/D Control/Status Register

ADCSR

R/W

00

Internal Watchdog Timer   WDT

Addr.

Register

Abbr.

R/W

Init.

FFEC

Timer Status/Control Register

TCSR

R/W

18

FFED

Timer Counter

TCNT

R/W

00

Interrupt Control   INTC

Addr.

Register

Abbr.

R/W

Init.

FFF0

Interrupt priority Register A

IPRA

R/W

00

FFF1

Interrupt priority Register B

IPRB

R/W

00

FFF2

Interrupt priority Register C

IPRC

R/W

00

FFF3

Interrupt priority Register D

IPRD

R/W

00

FFF4

Data Transfer Enable Register A

DTEA

R/W

00

FFF5

Data Transfer Enable Register B

DTEB

R/W

00

FFF6

Data Transfer Enable Register C

DTEC

R/W

00

FFF7

Data Transfer Enable Register D

DTED

R/W

00

Miscellaneous

Addr.

Register

Abbr.

R/W

Init.

FFF8

Wait State Control Register

WCR

R/W

F3

FFF9

RAM Control Register

RAM

R/W

FF

FFFA

Mode Control Register

MDCR

R

C3/C4

FFFB

Software Standby Control Register

SBYCR

R/W

7F

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