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M38B53M4-059FP датащи(PDF) 234 Page - Mitsubishi Electric Semiconductor

номер детали M38B53M4-059FP
подробное описание детали  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  355 Pages
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производитель  MITSUBISHI [Mitsubishi Electric Semiconductor]
домашняя страница  http://www.mitsubishichips.com
Logo MITSUBISHI - Mitsubishi Electric Semiconductor

M38B53M4-059FP датащи(HTML) 234 Page - Mitsubishi Electric Semiconductor

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2-146
38B5 Group User’s Manual
APPLICATION
2.8 Watchdog timer
Fig. 2.8.5 Control procedure
2.8.4 Notes on use
q The watchdog timer continues to count even while waiting for stop release. Accordingly, make sure that
watchdog timer does not underflow during this term by writing to the watchdog timer control register
(address 002B16) once before executing the STP instruction, etc.
q Once a “1” is written to the STP instruction disable bit (bit 6) of the watchdog timer control register
(address 002B16), it cannot be programmed to “0” again. This bit becomes “0” after reset.
Figure 2.8.5 shows the control procedure.
Initialization
SEI
CLT
CLD
CPUM (address 003B16)
000XXX002
Main processing
RESET
CPU mode register setting
(single-chip mode, main clock oscillating, high-speed mode)
WDTCON (address 002B16)
00XXXXXX2
Count of watchdog timer start
(STP instruction enabled, WDTH count source)
CLI
qX: This bit is not used here. Set it to “0” or “1” arbitrarily.



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