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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: 25/57頁
文件大小: 372K
代理商: W921E880A
W921E880A/W921C880
Publication Release Date: September 1998
- 25 -
Revision A2
When the COMPTR register bit0 is set by software, the comparator starts and the bit2 of the
COMPTR register will be set to "1" initially. The comparing result will be stored in the bit2 of the
COMPTR register and will keep this value until the bit0 of the COMPTR register is set again. The only
way to disable the comparator is to reset the bit0 of the COMPTR register using the software control.
The initial value of the COMPTR bit2 is "1", the falling edge of COMPTR bit2 will cause the
comparator interrupt to become active if the enable flag of the comparator interrupt is set.
The bit3 of the COMPTR register controls the source of Input voltage reference (Vref). The input
reference voltage (Vref) comes from external pin (P5.2/Vref) or D/A converter analog signal output
(P5.3/DAOUT).
6.11 Timer 0 3
There are four timers (TM0, TM1, TM2 and TM3) in this chip, and all are initialized at any time by
writing data into the TM0, TM1, TM2 and TM3 Set Reg.
TM0
can perform the following function:
1. 2
19 order divider
2. Auto-reload Timer
3. Watch-dog timer
TM0 Control
Register
TM0 Interrupt
Logic
Watch Dog
Timer
TM0 Control
Logic
Interrupt Control
Register
TM0 Set Register
(8 bits)
8 Order Divider
f
TM0
f
SYS1
f
SYS0
TM0 Low Speed
Register
System
Clock
1/4
f
SYS
11-bit Prescaler
5-bit Prescaler
Low Speed
Clock
1/8
f
SUB
High Speed
Clock
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