sm89516 SyncMOS Technologies,Inc, sm89516 Datasheet - Page 9

• Manufacturer Part Number: sm89516
• Description: 8-bits Micro-controller With 64kb Flash & 1kb Ram Embedded
• Manufacturer: SyncMOS Technologies,Inc

From external address $0000 to $02FF is the on-chip expanded RAM area, total 768 bytes. This area can be
accessed by external direct addressing mode only (by instruction MOVX).
Internal RAM Control Register (RCON, $85)
SM89516A has 768 byte on-chip RAM which can be accessed by external memory addressing method only. (By
instruction MOVX). The address space of instruction MOVX @Rn is determined by bit 1 and bit 0 (RAMS1, RAMS0)
of RCON. The default setting of RAMS1, RAMS0 bits is 00 (page0).
The port 0, port2, port3.6 and port3.7 can be used as general purpose I/O pin while port0 is open-drain structure.
System Control Register (SCONF, $BF)
WDR: Watch Dog Timer Reset. When system reset by Watch Dog Timer overflow, WDR will be set to 1
OME: 768 bytes on-chip RAM enable bit
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M010Ver:B SM89516
Data Memory - Expanded 768 bytes
Read / Write:
Reset value:
Read / Write:
Reset value:
SyncMOS Technologies International, Inc.
RAMS1
0
0
1
WDR
Unused
bit-7
R/W
bit-7
0
*
-
RAMS0
Unused
Unused
0
1
0
*
-
-
*
Unused
Unused
MOVX @Ri i=0,1 mapping to expended RAM address
*
-
-
*
Unused
Unused
9
*
-
-
*
$0000 ~ $00FF
$0100 ~ $01FF
$0200 ~ $02FF
Unused
Unused
*
-
-
*
With 64KB flash & 1KB RAM embedded
Unused
Unused
8-Bits Micro-controller
-
*
*
-
OME
RAMS1
R/W
R/W
1
0
SM89516
RAMS0
ALEI
bit-0
R/W
bit-0
R/W
0
05/2009
0