W921E840A Datasheet, PDF(28/58 Page) Winbond

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W921E840A Datasheet, PDF (28/58 Pages) Winbond – 4-BIT MICROCONTROLLER

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W921E840A/W921C840

6.11 Timer/Counter

There are four timers (TM0, TM1, TM2 and TM3) in this chip, and all can be initialized at any time by

writing data into the TM0, TM1, TM2 and TM3 set register.

6.11.1 TM0

TM0 can perform the following functions:

1. 2 to19 order divider

2. Auto-reload timer

3. Watch-dog timer

High Speed

Clock

TM0 Control

System

Clock

1/4

1/8

f SYS

f SUB

11-bit Prescaler

fSYS0

f TM0

f SYS1

5-bit Prescaler

Interrupt Control

8 Order Divider

TM0 Set Register

(8 bits)

TM0 Control

Logic

TM0 Interrupt

Logic

Watch Dog

Timer

Low Speed

Clock

TM0 Low Speed

The format of the TM0 control register (TM0CR) is described below:

TM0CR register: (address = 020H, default data = 0H)

Reserved

b1 b0 Input frequency (fSYS0 )

fsys/2 Hz

fsys/256 Hz

1 0 fsys/1024 Hz

1 1 fsys/2048 Hz

The TM0 set register is divided into TM0 MSB data register (TM0MSB register, address = 021H,

default = 0FH) and TM0 LSB data register (TM0LSB register, address = 022H, default = 0FH).

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