SM8958A Datasheet, PDF (8/25 Pages) SyncMOS Technologies,Inc – 8 - Bit Micro-controller with 32KB flash & 1KB RAM embedded

SyncMOS Technologies Inc.
September 2002
SM8958A
BS3
BS2
BS1
BS0 040h~07fh map-
ping address
Note
0
0
0
0
000h~03fh
lower 128 byte RAM
0
0
0
1
040h~07fh
lower 128 byte RAM
0
0
1
0
080h~0bfh
higher 128 byte RAM
0
0
1
1
0c0h~0ffh
higher 128 byte RAM
0
1
0
0
0000h~003fh on-chip expanded 768 byte RAM
0
1
0
1
0040h~007fh
“
0
1
1
0
0080h~00bfh
“
0
1
1
1
00c0h~00ffh
“
1
0
0
0
0100h~013fh
“
1
0
0
1
0140h~017fh
“
1
0
1
0
0180h~01bfh
“
1
0
1
1
01c0h~01ffh
“
1
1
0
0
0200h~023fh
“
1
1
0
1
0240h~027fh
“
1
1
1
0
0280h~02bfh
“
1
1
1
1
02c0h~02ffh
“
With this bank mapping scheme, user can access entire 1K byte on-chip RAM with direct addressing method. That means
using the window area ($040~$07F), user can access any bank (64 byte) data of 1K byte on-chip RAM space which is
selected by BS[3:0] of data bank control register (DBANK, $86).
For example, user write #30h to $101 address:
MOV DBANK, #88H
; set bank mapping $040~$07f to $0100~$013f
MOV A, # 30H
; store #30H to A
MOV 41H, A
; write #30H to $0101 address
Specifications subject to change without notice,contact your sales representatives for the most recent information.
8/25
Ver 1.0 PID 8958A 09/02