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P89C51RC2BA/01 датащи(PDF) 41 Page - NXP Semiconductors

номер детали P89C51RC2BA/01
подробное описание детали  80C51 8-bit Flash microcontroller family
PDF  68 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

P89C51RC2BA/01 датащи(HTML) 41 Page - NXP Semiconductors

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Philips Semiconductors
Preliminary data
P89C51RA2/RB2/RC2/RD2xx
80C51 8-bit Flash microcontroller family
8KB/16KB/32KB/64KB ISP/IAP Flash with 512B/512B/512B/1KB RAM
2002 Jul 18
41
INIT_WATCHDOG:
MOV CCAPM4, #4CH
; Module 4 in compare mode
MOV CCAP4L, #0FFH
; Write to low byte first
MOV CCAP4H, #0FFH
; Before PCA timer counts up to
; FFFF Hex, these compare values
; must be changed
ORL CMOD, #40H
; Set the WDTE bit to enable the
; watchdog timer without changing
; the other bits in CMOD
;
;********************************************************************
;
; Main program goes here, but CALL WATCHDOG periodically.
;
;********************************************************************
;
WATCHDOG:
CLR EA
; Hold off interrupts
MOV CCAP4L, #00
; Next compare value is within
MOV CCAP4H, CH
; 255 counts of the current PCA
SETB EA
; timer value
RET
Figure 37. PCA Watchdog Timer Initialization Code



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