83C576 Datasheet, PDF (19/46 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
Product specification
83C576/87C576
TXD
INT. BUS
WRITE TO LATCH
TXI
D
Q
P3.1
LATCH
PROGRAMMABLE OUTPUT BUFFER
Figure 13. TXI (AUXR.2) Bit Inverts the TxD Pin (P3.1) When Set
P3.1
PIN
SU00711
WRITE TO
CCAP4H
RESET
WRITE TO
CCAP4L
0
1
ENABLE
CIDL
WDTE
––
––
CCAP4H
CCAP4L
16–BIT COMPARATOR
MATCH
––
CPS1
CPS0
ECF
CMOD
(D9H)
RESET
CH
CL
PCA TIMER/COUNTER
––
ECOMn CAPPn CAPNn MATn
TOGn
PWMn
ECCFn
CCAPM4
(DEH)
0
0
1
X
0
X
Figure 14. PCA Watchdog Timer
SU00042
WATCHDOG FEED SEQUENCE
MOV WFEED1,#0A5H
MOV WFEED2,#5AH
OSC/2
PRESCALER
WDL
(C1H)
8–BIT DOWN
COUNTER
WDTOF (PCON.2)
RESET
1998 Jun 04
SHADOW REGISTER
FOR WDCON
PRE2
PRE1
PRE0
LVRE
OFRE
DPD
WDRUN
WDMOD
WDCON
(C4H)
Figure 15. Watchdog Timer in 87C576 and 80C576 / 83C576 (EA = 0)
SU00657C
19