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| 型号： | TMP86CH47IUG |
| 厂商： | Toshiba Corporation |
| 英文描述： | Zener Diode; Application: General; Pd (mW): 500; Vz (V): 17.5 to 18.3; Condition Iz at Vz (mA): 5; C (pF) max: -; Condition VR at C (V):   ESD (kV) min: -; Package: DO-35 |
| 中文描述： | 8位微控制器 |
| 文件页数： | 78/160页 |
| 文件大小： | 1627K |
| 代理商： | TMP86CH47IUG |
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Page 70
8. 16-Bit TimerCounter 1 (TC1)
8.3 Function
TMP86CH47IUG
8.3.2
External Trigger Timer Mode
In the external trigger timer mode, the up-counter starts counting by the input pulse triggering of the TC1
pin, and counts up at the edge of the internal clock. For the trigger edge used to start counting, either the rising
or falling edge is defined in TC1CR<TC1S>.
When TC1CR<METT1> is set to “1” (trigger start and stop)
When a match between the up-counter and the TC1DRA value is detected after the timer starts, the
up-counter is cleared and halted and an INTTC1 interrupt request is generated.
If the edge opposite to trigger edge is detected before detecting a match between the up-counter
and the TC1DRA, the up-counter is cleared and halted without generating an interrupt request.
Therefore, this mode can be used to detect exceeding the specified pulse by interrupt.
After being halted, the up-counter restarts counting when the trigger edge is detected.
When TC1CR<METT1> is set to “0” (trigger start)
When a match between the up-counter and the TC1DRA value is detected after the timer starts, the
up-counter is cleared and halted and an INTTC1 interrupt request is generated.
The edge opposite to the trigger edge has no effect in count up. The trigger edge for the next count-
ing is ignored if detecting it before detecting a match between the up-counter and the TC1DRA.
Since the TC1 pin input has the noise rejection, pulses of 4/fc [s] or less are rejected as noise. A pulse width
of 12/fc [s] or more is required to ensure edge detection. The rejection circuit is turned off in the SLOW1/2 or
SLEEP1/2 mode, but a pulse width of one machine cycle or more is required.
Example 1 :Generating an interrupt 1 ms after the rising edge of the input pulse to the TC1 pin
(fc =16 MHz)
LDW
(TC1DRA), 007DH
; 1ms
÷
2
7
/fc
=
7DH
DI
; IMF
=
“0”
SET
(EIRL). 7
; Enables INTTC1 interrupt
EI
; IMF
=
“1”
LD
(TC1CR), 00000100B
; Selects the source clock and mode
LD
(TC1CR), 00100100B
; Starts TC1 external trigger, METT1
=
0
Example 2 :Generating an interrupt when the low-level pulse with 4 ms or more width is input to the TC1 pin
(fc =16 MHz)
LDW
(TC1DRA), 01F4H
; 4 ms
÷
2
7
/fc
=
1F4H
DI
; IMF
=
“0”
SET
(EIRL). 7
; Enables INTTC1 interrupt
EI
; IMF
=
“1”
LD
(TC1CR), 00000100B
; Selects the source clock and mode
LD
(TC1CR), 01110100B
; Starts TC1 external trigger, METT1
=
1
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相关代理商/技术参数 |
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|---|---|
| TMP86CH47SUG | 制造商:TOSHIBA 制造商全称:Toshiba Semiconductor 功能描述:8 Bit Microcontroller |
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