W742C814 データシートの表示（PDF） - Winbond

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W742C814

4-BIT MICROCONTROLLER

Winbond 

W742C814

WDTR.0 will be set to one when WDT time out and can be reset to zero by:

POWER ON RESET, RESET PIN, CLR WDT

Table 2. The bit 1 of WatchDog Timer Register (WDTR) reset item

RESET ITEM

Program Counter (PC)

WDTR.1 = 1

0000H

Stack Pointer (SP)

ROMPR, PAGE, DBKR, WRP, ACC, CF, ZF, SCR

Registers

IEF, HEF, SEF, HCF, PEF, EVF Flags

DIV0, DIV1

TM0, TM1, MR0, MR1 Registers

-

-

IEF = Reset

-

-

Timer 0 Input Clock

-

Timer 1 Input Clock

-

MFP Output

-

PM0 Register

-

PM1, PM2, PM5 Registers

-

PSR0 Register

-

Input/Output Orts RA, RB, RD

-

Output Ports RE

-

RA, RB Ports Output Type

-

RC Port Pull-high Resistors

-

Input Clock of the Watchdog Timer

-

DTMF Output

-

BUZCR Register

-

FLCD

-

LCD Display

-

LCDR

-

Segment Output Mode

-

-: keep the status

Note: SCR.2 is reserved

WDTR.1 = 0

0000H

Reset

Reset

Reset

Reset

Reset

FOSC/4

FOSC

Low

Reset

Set (1111B)

Reset

Input mode

High

CMOS type

Disable

FOSC/2048

Hi-Z

Reset

Q5 to Q9 Reset

OFF

Reset

LCD drive output

6.11 Timer/Counter

6.11.1 Timer 0 (TM0)

Timer 0 (TM0) is a programmable 8-bit binary down-counter. The specified value can be loaded into

TM0 by executing the MOV TM0L(TM0H),R instructions. When the MOV TM0L(TM0H),R instructions

are executed, it will stop the TM0 down-counting (if the TM0 is down-counting) and reset the MR0.3 to

- 15 -

Publication Release Date: February 12, 2003

Revision A2

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