80C575 Datasheet, PDF (19/40 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer

Philips Semiconductors
80C51 8-bit microcontroller family
8K/256 OTP/ROM/ROMless, 4 comparator, failure detect circuitry, watchdog timer
Product specification
80C575/83C575/
87C575
WATCHDOG FEED SEQUENCE
MOV WFEED1,#0A5H
MOV WFEED2,#5AH
OSC/12
PRESCALER
8–BIT DOWN
COUNTER
ROM–CODE
CONTENT
WD
PRE2:0
WDMOD
ADDRESS
2032H
2031H
2030H
SHADOW REGISTER
FOR WDCON
PRE2
PRE1
PRE0
LVRE
1
OFRE
WDRUN
WDTOF
WDMOD
WDCON
(C0H)
Figure 15. Watchdog Timer of 83C575 in Watchdog Mode (EA = 1, WDMOD = 1)
SU00241
WATCHDOG FEED SEQUENCE
MOV WFEED1,#0A5H
MOV WFEED2,#5AH
OSC/12
PRESCALER
8–BIT DOWN
COUNTER
ROM–CODE
CONTENT
WD
PRE2:0
WDMOD
ADDRESS
2032H
2031H
2030H
SHADOW REGISTER
FOR WDCON
PRE2
PRE1
PRE0
LVRE
0
OFRE
WDRUN
WDTOF
WDMOD
WDCON
(C0H)
Figure 16. Watchdog Timer of 83C575 in Timer Mode (EA = 1, WDMOD = 0)
SU00242
1998 May 01
19