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M38B53M4-059FP Datasheet(PDF) 232 Page - Mitsubishi Electric Semiconductor

Part # M38B53M4-059FP
Description  8-BIT SINGLE-CHIP MICROCOMPUTER
PDF  355 Pages
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Manufacturer  MITSUBISHI [Mitsubishi Electric Semiconductor]
Direct Link  http://www.mitsubishichips.com
Logo MITSUBISHI - Mitsubishi Electric Semiconductor

M38B53M4-059FP Datasheet(HTML) 232 Page - Mitsubishi Electric Semiconductor

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2-144
38B5 Group User’s Manual
APPLICATION
2.8 Watchdog timer
Fig. 2.8.2 Structure of watchdog timer control register
2.8 Watchdog timer
The watchdog timer is a 20-bit down-count counter consisting of a low-order 8 bits and a high-order 12 bits.
“1” is subtracted from the watchdog timer each time a count source inputs.
This paragraph describes the setting method of watchdog timer relevant register, notes etc.
2.8.1 Memory assignment
Fig. 2.8.1 Memory assignment of watchdog timer relevant register
2.8.2 Relevant register
The watchdog timer starts counting by writing an arbitrary value to the watchdog timer control register.
Figure 2.8.2 shows the structure of the watchdog timer control register.
Watchdog timer contort register (WDTCON)
002B16
Address
Watchdog timer control register
b7 b6 b5 b4 b3 b2 b1 b0
Watchdog timer control register
(WDTCON: address 2B16)
b
0
1
2
3
4
5
6
1
Functions
Name
At reset R W
1
1
1
1
1
0
Watchdog timer H
(high-order 6 bits of reading exclusive)
STP instruction
disable bit
0: STP instruction enabled
1: STP instruction disabled
7
0
Watchdog timer H
count source
selection bit
0: Watchdog timer L
underflow
1: f(XIN)/16 or f(XCIN)/16



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