87C575 Philips Semiconductors, 87C575 Datasheet - Page 19

• Manufacturer Part Number: 87C575
• Description: 80C51 8-bit microcontroller family 8K/256 OTP/ROM/ROMless/ 4 comparator/ failure detect circuitry/ watchdog timer
• Manufacturer: Philips Semiconductors

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