SM79164 Datasheet, PDF (7/25 Pages) SyncMOS Technologies,Inc – 8 - Bit Micro-controller with 64KB flash & 4KB RAM embedded

SyncMOS Technologies International. Inc.
SM79164
0EFF
FF _{Higher 128 bytes (Access by}
SFR (Accessed by direct
80 ^{indirect addressing mode only) addressing mode only)}
7F _{Lower 128 bytes (Accessed by}
00 ^{direct & indirect addressing mode)}
Expanded 3840 bytes RAM
(Accessed by direct external
addressing mode, by instruction
MOVX, or by Bank mapping
FF ^{direct addressing mode)}
(OME = 1)
80
0000
On-chip expanded RAM address structure.
1.2.1 Data Memory - Lower 128 byte ($00 to $7F, Bank 0 & Bank 1)
Data Memory $00 to $FF is the same as 8052.
The address $00 to $7F can be accessed by direct and indirect addressing modes.
Address $00 to $1F is register area.
Address $20 to $2F is memory bit area.
Address $30 to $7F is for general memory area.
1.2.2 Data Memory - Higher 128 byte ($80 to $FF, Bank 2 & Bank 3)
The address $80 to $FF can be accessed by indirect addressing mode or by bank mapping direct addressing mode.
Address $80 to $FF is data area.
1.2.3 Data Memory - Expanded 3840 bytes ($0000 to $0EFF, Bank 4 ~ Bank 63)
From external address $0000 to $0EFF is the on-chip expanded RAM area, total 3840 bytes. This area can be accessed
by external direct addressing mode (by instruction MOVX) or by bank mapping direct addressing mode as described
below:
1.3 Bank mapping direct addressing mode:
We provide RAM bank address ‘40H~7FH’ as mapping window which allow user access all the 4KB on-chip RAM through
this RAM bank address.
That means using direct addressing mode can access all the 4KB on-chip RAM. Please see next page for the mapping
mode table.
Specifications subject to change without notice,contact your sales representatives for the most recent information.
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Ver 2.1 SM79164 08/2006