MDT10P22(DC)

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P. 5

2005/6

Ver. 1.4

(1) IAR ( Indirect Address Register) : R0

(2) RTCC (Real Time Counter/Counter Register) : R1

(3) PC (Program Counter) : R2

Write PC, CALL --- always 0

LJUMP, JUMP, LCALL --- from instruction word

RTWI, RET --- from STACK

A9

A8

A7~A0

Write PC, JUMP, CALL --- from STATUS b5

LJUMP, LCALL --- from instruction word

RTWI, RET --- from STACK

Write PC --- from ALU

LJUMP, JUMP, LCALL, CALL --- from instruction word

RTWI, RET --- from STACK

(4) STATUS (Status register) : R3

Bit

Symbol

Function

0

1

2

3

4

5

7

C

HC

Z

PF

TF

page

——

Carry bit

Half Carry bit

Zero bit

Power loss Flag bit

Time overflow Flag bit

ROM Page select bit :

00 : 000H --- 1FFH

01 : 200H --- 3FFH

General purpose bit