GMS77C1001 Datasheet, PDF (32/44 Pages) Hynix Semiconductor – 8-BIT SINGLE-CHIP MICROCONTROLLERS

GMS77C1000/GMS77C1001
12. CONFIGURATION AREA
The device configuration area can be programmed or left
unprogrammed to select device configurations such as os-
cillator type, security bit or watchdog timer enable bit.
bit11
43
bit0
AAA_H
-
ID0
AAA_H+1
-
ID1
AAA_H+2
-
ID2
AAA_H+3
-
ID3
Four memory locations [AAAH ~ (AAA+3)_H] are desig-
nated as customer ID recording locations where the user
can store check-sum or other customer identification num-
bers. These area are not accessible during normal execu-
tion but are readable and writable during program/verify
mode. It is recommended that only the 4 least significant
bits of ID recording locations are used.
FFF_H
Configuration Word
FIGURE 12-1 DEVICE CONFIGURATION AREA
bit11
4 3 2 1 bit0
Configuration Word
-
CP WDTE FOSC1 FOSC0
bit 3
bit 2
bit 1-0
Unimplemented, read as ‘0’
CP : Code protection bit.
1 = Code protection disabled
0 = Code protection enabled
WDTE: Watchdog timer enable bit
1 = WDT enabled
0 = WDT disabled
FOSC1:FOSC0: Oscillator selection bits
11 = RC oscillator
10 = HF oscillator
01 = XT oscillator
00 = LF oscillator
Address : FFF_H
FIGURE 12-2 CONFIGURATION WORD FOR GMS77C1000/1001
July. 2001 Ver. 1.1
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