SyncMOS Technologies Inc.
September 2002
SM89516A
BS3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
BS2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
BS1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
BS0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
040h~07fh map-
ping address
000h~03fh
040h~07fh
080h~0bfh
0c0h~0ffh
0000h~003fh
0040h~007fh
0080h~00bfh
00c0h~00ffh
0100h~013fh
0140h~017fh
0180h~01bfh
01c0h~01ffh
0200h~023fh
0240h~027fh
0280h~02bfh
02c0h~02ffh
Note
lower 128 byte RAM
lower 128 byte RAM
higher 128 byte RAM
higher 128 byte RAM
on-chip expanded 768 byte RAM
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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 1.2
SM89516A 09/02
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
