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參數資料
| 型號： | W921F840 |
| 廠商： | WINBOND ELECTRONICS CORP |
| 英文描述： | 4-Bit Microcontroller(4位的微控制器) |
| 中文描述： | 4位微控制器（第4位的微控制器） |
| 文件頁數： | 31/68頁 |
| 文件大小： | 451K |
| 代理商： | W921F840 |
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W921F840
Publication Release Date: October 1997
- 31 -
Revision A1
The TM1 set register is divided into TM1 MSB data register (TM1MSB register, address = 026H,
default = 0FH) and TM1 LSB data register (TM1LSB register, address = 027H, default = 0FH).
The TM1 read register is divided into TM1 read only MSB data register (TM1RM register, address =
01CH, default = 0FH) and TM1 read only LSB data register (TM1RL register, address = 01DH, default
= 0FH).
The format of the TM1 status register (STTM1) is described below:
STTM1 register: (address = 028H, default data = 0H)
b3
b2
b1
b0
0:TM1 stop
1:TM1 start
0:
1:
TM1 normal function selected
Special function selected
Reserved
0:TM1 auto-reload disable
1:TM1 auto-reload enable
If the TM1 is in the timer mode, divider will overflow when it is from 00H to 0FFH and the value in the
TM1MSB and TM1LSB will be auto reloaded into the TM1 set register when the STTM1 bit2 is set.
TM1 will be decreased by 1 continuously when each clock input after the timer is starting.
At any time the STTM1 bit3 is from 0 to 1 (disable to enable) the TM1MSB and TM1LSB will be auto
reloaded to the TM1 set register again and restart the TM1. TM1 will stop operating while the STTM1
bit3 is reset to 0.
The TM1 starts to down count when the STTM1 register bit3 is set. When TM1 overflows, the STTM0
bit3 will be reset by hardware to stop TM1 if the auto-reload is disabled, but the STTM1 bit3 will not
be reset if the auto-reload is enabled.
When the TM1 normal timer function is performed, the special function (event counter or arbitrary
waveform generator) will be disabled automatically. The special function input or output is from or to
P5.0 and the debounce time is one system clock (
f
SYS
).
The format of the TM1 trigger/event counter condition register (TGTM1) is described below:
TGTM1 register: (address = 029H, default data = 0H)
b3
b2
b1
b0
0: Event counter is falling edge trigger
1: Event counter is rising edge trigger
0: Special function work as event counter
1: Special function work as arbitrary
waveform generator
0: Arbitrary waveform type 0
1: Arbitrary waveform type 1
Reserved
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