M38B53M4-059FP datasheet(295/355 Pages) MITSUBISHI

295 / 355 page

38B5 Group User’s Manual

3-47

APPENDIX

3.5 Control registers

Fig. 3.5.26 Structure of watchdog timer control register

Fig. 3.5.27 Structure of timer X (low-order, high-order)

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

Timer X (low-order, high-order)

b7 b6 b5 b4 b3 b2 b1 b0

Timer X (low-order, high-order)

(TXL, TXH: addresses 2C16, 2D16)

Functions

At reset R W

• Set timer X count value.

• When the timer X write control bit of the timer

X mode register 1 is “0”, the value is written to

timer X and the latch at one time.

When the timer X write control bit of the timer

X mode register 1 is “1”, the value is written

only to the latch.

• The timer X count value is read out by reading

this register.

Notes 1: When reading and writing, perform them to both the high-

order and low-order bytes.

2: Read both registers in order of TXH and TXL following.

3: Write both registers in order of TXL and TXH following.

4: Do not read both registers during a write, and do not write to

both registers during a read.

M38B53M4-059FP Datasheet(PDF) 295 Page - Mitsubishi Electric Semiconductor

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