87C576 데이터 시트보기 (PDF) - Philips Electronics

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87C576

80C51 8-bit microcontroller family 8K/256 OTP/ROM, 6 channel 10-bit A/D, 4 comparators, failure detect circuitry, watchdog timer

Philips Electronics 

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

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