Address

Abbreviation

Register Name

Hex

Binary

RS5

RS4

RS3

RS2

RS1

01

03

05

0

0

0

0

0

0

0

0

0

0

0

1

0

1

0

GPIP

AER

DDR

General Purpose I/O Register

Active Edge Register

Data Direction Register

07

09

0B

0D

0F

11

13

15

17

0

0

0

0

0

0

0

0

0

0

0

0

0

0

1

1

1

1

0

1

1

1

1

0

0

0

0

1

0

0

1

1

0

0

1

1

1

0

1

0

1

0

1

0

1

IERA

IERB

IPRA

IPRB

ISRA

ISRB

IMRA

IMRB

VR

Interrupt Enable Register A

Interrupt Enable Register B

Interrupt Pending Register A

Interrupt Pending Register B

Interrupt In-service Register A

Interrupt In-service Register B

Interrupt Mask Register A

Interrupt Mask Register B

Vector Register

19

1B

1D

1F

21

23

25

0

0

0

0

1

1

1

1

1

1

1

0

0

0

1

1

1

1

0

0

0

0

0

1

1

0

0

1

0

1

0

1

0

1

0

TACR

TBCR

TCDCR

TADR

TBDR

TCDR

TDDR

Timer A Control Register

Timer B Control Register

Timers C and D Control Register

Timer A Data Register

Timer B Data Register

Timer C Data Register

Timer D Data Register

27

29

2B

2D

2F

1

1

1

1

1

0

0

0

0

0

0

1

1

1

1

1

0

0

1

1

1

0

1

0

1

SCR

UCR

RSR

TSR

UDR

Synchronous Character Register

USART Control Register

Receiver Status Register

Transmitter Status Register

USART Data Register

Not e : H ex addr esses assume that RS1 connects w ith A1, RS 2connects wi th A2, etc.. . and that D S is connected t o LD S on

the 68000 or D S is connect to DS on the 68008.

Figure 2 : CMFP Register Map.

®

TS68HC901

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