M38B53M4-059FP datasheet(232/355 Pages) MITSUBISHI

No. de pieza	M38B53M4-059FP

Descripción Electrónicos	8-BIT SINGLE-CHIP MICROCOMPUTER

PDF	355 Pages

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Fabricante Electrónico	MITSUBISHI [Mitsubishi Electric Semiconductor]

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232 / 355 page

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)

Functions

Name

At reset R W

Watchdog timer H

(high-order 6 bits of reading exclusive)

STP instruction

disable bit

0: STP instruction enabled

1: STP instruction disabled

Watchdog timer H

count source

selection bit

0: Watchdog timer L

underflow

1: f(XIN)/16 or f(XCIN)/16

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