MDT2020(DF)

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P. 2

2005/6

VER 1.3

6. Memory Map

(A) Register Map

Address

Description

00

Indirect Addressing Register

01

RTCC

02

PC

03

STATUS

04

MSR

05

Port A

06

Port B

07

Port C

08~0F

Internal RAM, General Purpose Register

10~1F

Internal Memory Select Register

30~3F

Internal Memory Select Register

50~5F

Internal Memory Select Register

70~7F

Internal Memory Select Register

(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

A10

A9

A8

A7~A0

Write PC, JUMP, CALL --- from STATUS b6 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