W921E840A Datasheet, PDF (32/58 Pages) Winbond – 4-BIT MICROCONTROLLER

W921E840A/W921C840
6.11.3 TM2
TM2 can perform the following functions:
1. 2 to19 order divider
2. Auto-reload timer
3. Arbitrary waveform generator
4. Period/pulse width measurement function
System
Clock
f SYS
11-bit Prescaler
1/4
f TM2
High Speed
Clock
TM2 Control
Register
TM2 Read
Register
8 Order Divider
Interrupt Control
Register
TM2 Interrupt
Logic
Port 5.1
Period/Pulse Width
Measurement
TM2 Set Register
(8 bits)
Arbitrary
Waveform
Generator
TM2 Control Logic
TM2CR register: (address = 02AH, default data = 0H)
b3
b2
b1
b0
b3 b2 b1 b0 Input frequency (f_TM2 )
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 TM2 set register is divided into TM2 MSB data register (TM2MSB register, address = 02BH,
default = 0FH) and TM2 LSB data register (TM2LSB register, address = 02CH, default = 0FH).
The TM2 read register is divided into TM2 read only MSB data register (TM2RM register, address =
01EH, default = 0FH) and TM2 read only LSB data register (TM2RL register, address = 01FH, default
= 0FH).
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