SM8958A Datasheet, PDF (6/25 Pages) SyncMOS Technologies,Inc – 8 - Bit Micro-controller with 32KB flash & 1KB RAM embedded

SyncMOS Technologies Inc.
September 2002
SM8958A
Extension Function Description
1. Memory Structure
The SM8958A is the general 8052 hardware core as a single chip micro controller. Its memory structure follows general 8052
structure.
1.1 Program Memory
The SM8958A has 32K byte on-chip flash memory which used as general program memory. The address range for the 32K
byte is $0000 to $7FFF.
7FFF
32K Program
memory space
0000
Note: The single flash block address structure for doing as well as program ROM flash.
1.2 Data Memory
The SM8958A has 1K bytes on-chip RAM, 256 bytes of it are the same as general 8052 internal memory structure while the
expanded 768 bytes on-chip RAM can be accessed by external memory addressing method (by instruction MOVX), or by
‘Bank mapping direct addressing mode’ as described in next page.
02FF
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)}
On-chip expanded RAM address structure.
Expanded 768 bytes RAM
(Accessed by direct external
addressing mode, by instruction
MOVX, or by Bank mapping
FF ^{direct addressing mode)}
( OME = 1 )
80
0000
Specifications subject to change without notice,contact your sales representatives for the most recent information.
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Ver 1.0 PID 8958A 09/02