MDT2020(DF)

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P. 3

2005/6

VER 1.3

(4) STATUS (Status register) : R3

Bit

Symbol

Function

0

1

2

3

4

6—5

7

C

HC

Z

PF

TF

page

——

Carry bit

Half Carry bit

Zero bit

Power loss Flag bit

Time overflow Flag bit

Page select bit :

00 : 000H --- 1FFH

01 : 200H --- 3FFH

10 : 400H --- 5FFH

11 : 600H --- 7FFH

General purpose bit

(5) MSR (Memory Select Register) : R4

Memory Select Register :

00 : 10~1F

01 : 30~3F

10 : 50~5F

11 : 70~7F

b7

b6

b5

b4

b3

b2

b1

b0

Read only “1”

Indirect Addressing Mode

(6) PORT A : R5

PA3~PA0, I/O Register

(7) PORT B : R6

PB7~PB0, I/O Register

(8) PORT C : R7

PC7~PC0, I/O Register