MDT2020FF Datasheet, PDF (3/16 Pages) Micon Design Technology Corporation – 8-bit micro-controller

6. Memory Map
MDT2020(FF)
(A) Register Map
Address
00
01
02
03
04
05
06
07
08~0F
10~1F
30~3F
50~5F
70~7F
Description
Indirect Addressing Register
RTCC
PC
STATUS
MSR
Port A
Port B
Port C
Internal RAM, General Purpose Register
Internal Memory Select Register
Internal Memory Select Register
Internal Memory Select Register
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
This specification are subject to be changed without notice. Any latest information please preview
http;//www.mdtic.com.tw
P. 2
2007/8 VER 1.5