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參數(shù)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(shù): 31/57頁
文件大?。?/td> 372K
代理商: W921E880A
W921E880A/W921C880
Publication Release Date: September 1998
- 31 -
Revision A2
Timer 2 starts to count when the STTM2 REG. bit3 is set. When Timer 2 underflows, the STTM2 bit3
will be reset by hardware to stop Timer 2 if the auto-reload is disabled, but the STTM2 bit3 will not be
reset if the auto-reload is enabled.
When the Timer 2 function is performed, the special function is automatically disabled.
The format of the trigger condition of the Timer 2 Register is shown as follows:
TGTM2 REG: (ADDRESS = 02EH)
(Default data = 0H)
b3
b2
b1
b0
0: Special function work as pulse/period
width measurement
1: Special function work as arbitrary
waveform generator
0: Arbitrary waveform type 0
1: Arbitrary waveform type 1
b1
b0
0
0
0
1
1
0
1
1
Trigger
-----
Rising
Falling
Both
In pulse/period width measurement mode, the measuring-data is the 1'S complement of the exact
data and the TM2 interrupt flag is set at every 255 timer clock occurences or if the 2nd trigger
condition occurs. So the measured pulse/period width is (255(N 1)
number of interrupt flag occurences,
TM2
is the 1'S complement of timer2 register, and T is the
period of the timer 2 clock. The special function input or output is from or to P5.1.
TM2)*T
+
, where N is the
TM3
can perform the following functions:
1. 2
19 order divider
2. Auto-reload timer.
System
Clock
1/4
11-bit Prescaler
TM3 Control
Register
TM0 Interrupt
Logic
TM3 Control
Logic
Interrupt Control
Register
TM3 Set Register
(8 bits)
8 Order Divider
f
TM3
f
SYS
High Speed
Clock
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