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SPECIAL FUNCTION REGISTER RESET STATES Table 10–1
REGISTER LOCATION RESET CONDITION RESET TYPE
PC N/A 0000h All
ACC E0h 00h All
B F0h 00h All
PSW D0h 00h All
SP 81h 07h All
DPTR 83h, 82h 0000h All
P0–P3 80h, 90h, A0h, B0h FFh All
IP B8h 0XX00000b All
IE A8h 0XX00000b All
TMOD 89h 00h All
TCON 88h 00h All
TH0 8Ch 00h All
TL0 8Ah 00h All
TH1 8Dh 00h All
TL1 8Bh 00h All
SCON 98h 00h All
SBUF 99h XXXXXXXXb All
PCON 87h 0UUU0U00b
00000U00b
00000000b
0U010U00b
External reset
Power on reset
No V
LI
reset
Watchdog Timer
MCON (DS5000) C6h UUUUUU0Ub
UUUUUU0Ub
11111000b
UUUUUU0Ub
External reset
Power on reset
No V
LI
reset
Watchdog Timer
MCON (DS5001) C6h UUUUU0UUb
UUUUU0UUb
11111000b
UUUUU0UUb
External reset
Power on reset
No V
LI
reset
Watchdog Timer
Encryption Key (DS5000) N/A UUh UUh UUh UUh UUh
UUh UUh UUh UUh UUh
Disabled
UUh UUh UUh UUh UUh
External reset
Power on reset
No V
LI
reset
Watchdog Timer
RPCTL (DS5001) D8h 0X00000Ub
0X00000Ub
0X000000b
0X00000Ub
External reset
Power on reset
No V
LI
reset
Watchdog Timer
Status (DS5001) DAh 00h All
RNR (DS5001) CFh XXh All
CRC (DS5001) C1h UUUUXXUUb
UUUUXXUUb
0000XX00b
UUUUXXUUb
External reset
Power on reset
No V
LI
reset
Watchdog Timer
CRC High (DS5001) C3h 00h All
CRC Low (DS5001) C2h 00h All
NOTES:
X indicates a bit that is indeterminate on a reset.
U indicates a bit that is unchanged from its previous state on a reset.