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參數資料
型號: W921E880A
廠商: WINBOND ELECTRONICS CORP
元件分類: 微控制器/微處理器
英文描述: 4-Bit Microcontroller(4位微控制器)
中文描述: 4-BIT, OTPROM, 4 MHz, MICROCONTROLLER, PQFP80
封裝: QFP-80
文件頁數: 27/57頁
文件大小: 372K
代理商: W921E880A
W921E880A/W921C880
Publication Release Date: September 1998
- 27 -
Revision A2
The format of the Status of Timer 0 Register is shown as follows:
STTM0 REG: (ADDRESS = 023H)
(Default data = 0H)
b3
b2
b1
b0
0:Timer 0 stop
1:Timer 0 start
0:Timer 0 normal function select
1:Watch-dog timer select
0:WDT not underflow
1:WDT underflow
0:Timer 0 auto-reload disable
1:Timer 0 auto-reload enable
If Timer 0 works as a Watch Dog Timer, then bit1 of the STTM0 REG will be set when WDT
underflows. Meanwhile, the system is reset just as in a power on reset except for the STTM0 bit1. The
WDT (STTM0 bit1) will only be reset to zero during a power on reset or during the RAM write mode.
In the timer mode or event counter mode a time out will be the programming data add 1
([TM0MSB,TM0LSB]+1). It is the same for timers TM1, TM2 and TM3.
TM1
can perform the following functions:
1. 2
19 order divider
2. Auto-reload timer.
3. Arbitrary waveform generator.
4. Event counter.
TM1 Interrupt
Logic
Interrupt Control
Register
TM1 Set Register
(8 bits)
8 Order Divider
System
Clock
1/4
11-bit Prescaler
TM1 Read
Register
TM1 Control Logic
Arbitrary
Waveform
Generator
TM1 Control
Register
f
TM1
f
SYS
Port 5.0
Event
Counter
Logic
2
High Speed
Clock
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