SyncMOS Technologies International, Inc.
SM5964
8-Bits Micro-controller
64KB ISP flash & 1KB RAM embedded
ISP Flash Data Register (ISPFD, $F6)
bit-7
bit-0
FD7
R/W
0
FD6
R/W
0
FD5
R/W
0
FD4
R/W
0
FD3
R/W
0
FD2
R/W
0
FD1
R/W
0
FD0
R/W
0
Read / Write:
Reset value:
FD7 ~FD0 : flash data for ISP function
The ISPFD provide the 8-bit data for ISP function
ISP Flash Control Register (ISPC, $F7)
bit-7
bit-0
ISPF0
R/W
0
START
R/W
0
Unused
Unused
Unused
Unused
Unused
ISPF1
R/W
0
Read / Write:
Reset value:
-
*
-
*
-
*
-
*
-
*
F[1: 0]: ISP function select bit
START: ISP function start bit
= 1: start ISP function which indicated by bit 1, bit 0 (F1, F0)
= 0: no operation
The START bit is read-only by default, software must write three specific values 55H, AAH and 55H sequentially to the
ISPFD register to enable the START bit write attribute. That is:
MOV ISPFD, #55H
MOV ISPFD, #0AAH
MOV ISPFD, #55H
Any attempt to set START bit will not be allowed without the procedure above.
After START bit set to 1 then the SM5964 hardware circuit will latch address and data bus and hold the program
counter until the START bit reset to 0 when ISP function finished. User does not need to check START bit status by
software method.
F[1:0]
00
01
10
11
ISP function
Byte program
Chip protect
Page erase
Chip erase
F[1:0]: ISP function select bit
One page of flash memory is 512 byte.
Specifications subject to change without notice contact your sales representatives for the most recent information.
Ver 2.2 SM5964 08/2006
11
SYNCMOS [ SYNCMOS TECHNOLOGIES,INC ]
