83C576 Philips Semiconductors, 83C576 Datasheet - Page 19

• Manufacturer Part Number: 83C576
• Description: 80C51 8-bit microcontroller family 8K/256 OTP/ROM/ 6 channel 10-bit A/D/ 4 comparators/ failure detect circuitry/ watchdog timer
• Manufacturer: Philips Semiconductors

Philips Semiconductors
1998 Jun 04
80C51 8-bit microcontroller family
8K/256 OTP/ROM, 6 channel 10-bit A/D, 4 comparators,
failure detect circuitry, watchdog timer
OSC/2
WRITE TO
CCAP4L
WATCHDOG FEED SEQUENCE
MOV WFEED1,#0A5H
MOV WFEED2,#5AH
0
WRITE TO
CCAP4H
1
WRITE TO LATCH
RESET
ENABLE
INT. BUS
Figure 15. Watchdog Timer in 87C576 and 80C576 / 83C576 (EA = 0)
TXD
Figure 13. TXI (AUXR.2) Bit Inverts the TxD Pin (P3.1) When Set
PRE2
CCAP4H
16–BIT COMPARATOR
CH
PCA TIMER/COUNTER
D
PRESCALER
LATCH
P3.1
CIDL
––
PRE1
Figure 14.
Q
ECOMn
WDTE
TXI
CCAP4L
PRE0
CL
PCA Watchdog Timer
CAPPn
19
––
LVRE
0
MATCH
CAPNn
PROGRAMMABLE OUTPUT BUFFER
OFRE
––
0
8–BIT DOWN
COUNTER
MATn
––
DPD
1
WDL
TOGn
CPS1
WDRUN
X
(C1H)
CPS0
PWMn
WDMOD
WDTOF (PCON.2)
0
83C576/87C576
P3.1
PIN
ECCFn
SU00711
ECF
WDCON
SHADOW REGISTER
(C4H)
X
FOR WDCON
Product specification
RESET
SU00657C
CMOD
(D9H)
RESET
CCAPM4
(DEH)
SU00042