W921E840A Datasheet, PDF (30/58 Pages) Winbond – 4-BIT MICROCONTROLLER

W921E840A/W921C840
6.11.2 TM1
TM1 can perform the following functions:
1. 2 to19 order divider
2. Auto-reload timer
3. Arbitrary waveform generator
4. Event counter
System
Clock
f SYS
11-bit Prescaler
1/4
f _TM1
TM1 Read
Register
Interrupt Control
Register
High Speed
Clock
TM1 Control
Register
Port 5.0
Event
Counter
Logic
8 Order Divider
2
TM1 Set Register
(8 bits)
TM1 Interrupt
Logic
Arbitrary
Waveform
Generator
TM1 Control Logic
The format of the TM1 control register (TM1CR) is described below:
TM1CR register: (address = 025H, default data = 0H)
b3
b2
b1
b0
b3 b2 b1 b0 Input frequency (f_TM1 )
0000
fsys/2 Hz
0001
fsys/4 Hz
0010
fsys/8 Hz
0011
fsys/16 Hz
0100
fsys/32 Hz
0101
fsys/64 Hz
0110
fsys/128 Hz
0111
fsys/256 Hz
1000
fsys/512 Hz
1001
fsys/1024 Hz
1010
fsys/2048 Hz
The TM1 set register is divided into TM1 MSB data register (TM1MSB register, address = 026H,
default = 0FH) and TM1 LSB data register (TM1LSB register, address = 027H, default = 0FH).
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