SM39R08A5 Datasheet, PDF (52/58 Pages) SyncMOS Technologies,Inc – Additional Baud Rate Generator

SM39R08A5
8-Bit Micro-controller
with 8KB Flash
& 256B RAM embedded
15. EEPROM
The SM39R08A5 can generate flash control signal by internal hardware circuit. The SM39R08A5 provides internal flash
control signals which can do flash program/page erase functions.
ISP register – TAKEY, IFCON, ISPFAH, ISPFAL, ISPFD and ISPFC:
Mnemonic
Description
Direct
TAKEY
Time Access Key
register
F7h
IFCON
Interface Control
register
8Fh
ISP Flash
ISPFAH Address - High
E1h
register
ISP Flash
ISPFAL Address - Low
E2h
register
ISPFD
ISP Flash Data
register
E3h
ISPFC
ISP Flash Control
register
E4h
Bit 7
-
-
Bit 6 Bit 5
ISP function
CDPR
-
-
-
Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 RESET
TAKEY [7:0]
-
-
-
00H
-
ISPE
00H
ISPFAH [7:0]
FFH
ISPFAL [7:0]
FFH
ISPFD [7:0]
FFH
-
- ISPF.2 ISPF.1 ISPF.0 00H
Mnemonic: TAKEY
Address: F7H
7
6
5
4
3
2
1
0
Reset
TAKEY [7:0]
00H
ISP enable bit (ISPE) is read-only by default, software must write three specific values 55h, AAh and 5Ah
sequentially to the TAKEY register to enable the ISPE bit write attribute. That is:
MOV TAKEY, #55h
MOV TAKEY, #AAh
MOV TAKEY, #5Ah
Mnemonic: IFCON
Address: 8FH
7
6
5
4
3
2
1
0
Reset
-
CDPR
-
-
-
-
-
ISPE
00H
The bit 0 (ISPE) of IFCON is ISP enable bit. User can enable overall SM39R08A5 EEPROM function by
setting ISPE bit to 1, to disable overall EEPROM function by set ISPE to 0. The function of ISPE behaves like a
security key. User can disable overall ISP function to prevent software program be erased accidentally. ISP
registers ISPFAH, ISPFAL, ISPFD and ISPFC are read-only by default. Software must be set ISPE bit to 1 to
enable these 4 registers write attribute.
Mnemonic: ISPFAH
Address: E1H
7
6
5
4
3
2
1
0
Reset
ISPFAH7 ISPFAH6 ISPFAH5 ISPFAH4 ISPFAH3 ISPFAH2 ISPFAH1 ISPFAH0 FFH
ISPFAH [7:0]: Flash address-high for EEPROM function.
Specifications subject to change without notice contact your sales representatives for the most recent information.
ISSFD-M067
Ver E SM39R08A5 06/30/2015
- 52 -