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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: 30/57頁
文件大小: 372K
代理商: W921E880A
W921E880A/W921C880
- 30 -
TM2CR REG: (ADDRESS = 02AH)
(Default data = 0H)
b3
b2
b1
b0
b1 b0
Input frequency (fTM2)
0
0
0
1
1
0
1
1
fsys/2 Hz
fsys/4 Hz
fsys/8 Hz
fsys/16 Hz
b3 b2
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
1
0
0
0
0
1
1
0
1
1
1
1
0
0
0
0
0
1
1
0
fsys/32 Hz
fsys/64 Hz
fsys/128 Hz
fsys/256 Hz
fsys/512 Hz
fsys/1024 Hz
fsys/2048 Hz
The Timer 2 Set REG. is divided into TIMER 2 MSB DATA REG. (TM2MSB REG, ADDRESS =
02BH, Default = 0FH) and TIMER 2 LSB DATA REG. (TM2LSB REG, ADDRESS = 02CH, Default =
0FH).
The Timer 2 READ REG. is divided into TIMER 2 READ ONLY MSB DATA REG. (TM2RM REG,
ADDRESS = 01EH, Default = 0FH) and TIMER 2 READ ONLY LSB DATA REG. (TM2RL REG,
ADDRESS = 01FH, Default = 0FH).
The format of the Status of Timer 2 Register is shown as follows:
STTM2 REG: (ADDRESS = 02DH)
(Default data = 0H)
b3
b2
b1
b0
0:Timer 2 stop
1:Timer 2 start
0:
1:
Timer 2 mormal function select
Special function select
0:Timer 2 auto-reload disable
1:Timer 2 auto-reload enable
Reserved
If Timer 2 is in the timer mode, the Timer 2 will underflow when it goes from 00H to FFH. The value
in TM2MSB and TM2LSB will be auto reloaded to the Timer 2 Set REG. Timer 2 will decrease by 1
continuously at each clock transition after the timer has started.
At any time the STTM2 bit3 goes from 0 to 1 (disable to enable), TM2MSB and TM2LSB will be auto
reloaded to the Timer 2 Set Reg. again and the Timer 2 is restarted. Timer 2 will stop operating when
the STTM2 bit3 is reset to 0.
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