83C576 Datasheet, PDF (20/46 Pages) NXP Semiconductors – 80C51 8-bit microcontroller family 8K/256 OTP/ROM, 6 channel 10-bit A/D, 4 comparators, failure detect circuitry, watchdog timer

Philips Semiconductors
80C51 8-bit microcontroller family
8K/256 OTP/ROM, 6 channel 10-bit A/D, 4 comparators,
failure detect circuitry, watchdog timer
WATCHDOG FEED SEQUENCE
MOV WFEED1,#0A5H
MOV WFEED2,#5AH
OSC/2
PRESCALER
8–BIT DOWN
COUNTER
Product specification
83C576/87C576
ROM–CODE
CONTENT
WDL
WDCON
ADDRESS
2031H
2030H
RESET
WDTOF (PCON.2)
PRE2
PRE1
PRE0
LVRE
OFRE
1
1
DPD
WDRUN
WDMOD
WDCON
(C4H)
Figure 16. Watchdog Timer of 83C576 in Watchdog Mode (EA = 1, WDMOD = 1)
SU00658C
WATCHDOG FEED SEQUENCE
MOV WFEED1,#0A5H
MOV WFEED2,#5AH
OSC/2
PRESCALER
WDL
(C1H)
ROM–CODE
CONTENT
WDCON
ADDRESS
2030H
8–BIT DOWN
COUNTER
WDTOF (PCON.2)
PRE2
PRE1
PRE0
LVRE
OFRE
0
DPD
WDRUN
WDMOD
WDCON
(C4H)
Figure 17. Watchdog Timer of 83C576 in Timer Mode (EA = 1, WDMOD = 0)
SU00659C
1998 Jun 04
20