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| 型號(hào)： | TMP86CH09NG |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 16 MHz, MICROCONTROLLER, PDIP32 |
| 封裝： | 0.400 INCH, 1.78 MM PITCH, LEAD FREE, PLASTIC, SDIP-32 |
| 文件頁(yè)數(shù)： | 4/120頁(yè) |
| 文件大?。?/td> | 1743K |
| 代理商： | TMP86CH09NG |
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Page 90
9. 8-Bit TimerCounter (TC3, TC4)
9.1 Configuration
TMP86FH09ANG
Figure 9-2 8-Bit Timer Mode Timing Chart (TC4)
9.3.2 8-Bit Event Counter Mode (TC3, 4)
In the 8-bit event counter mode, the up-counter counts up at the falling edge of the input pulse to the TCj pin.
When a match between the up-counter and the TTREGj value is detected, an INTTCj interrupt is generated and
the up-counter is cleared. After being cleared, the up-counter restarts counting at the falling edge of the input
pulse to the TCj pin. Two machine cycles are required for the low- or high-level pulse input to the TCj pin.
Therefore, a maximum frequency to be supplied is fc/24 Hz in the NORMAL1/2 or IDLE1/2 mode, and fs/24
Hz in the SLOW1/2 or SLEEP1/2 mode.
Note 1: In the event counter mode, fix TCjCR<TFFj> to 0. If not fixed, the PDOj, PWMj and PPGj pins may output
pulses.
Note 2: In the event counter mode, do not change the TTREGj setting while the timer is running. Since TTREGj is
not in the shift register configuration in the event counter mode, the new value programmed in TTREGj is in
effect immediately after the programming. Therefore, if TTREGi is changed while the timer is running, an
expected operation may not be obtained.
Note 3: j = 3, 4
Figure 9-3 8-Bit Event Counter Mode Timing Chart (TC4)
9.3.3 8-Bit Programmable Divider Output (PDO) Mode (TC3, 4)
This mode is used to generate a pulse with a 50% duty cycle from the PDOj pin.
In the PDO mode, the up-counter counts up using the internal clock. When a match between the up-counter
and the TTREGj value is detected, the logic level output from the PDOj pin is switched to the opposite state and
the up-counter is cleared. The INTTCj interrupt request is generated at the time. The logic state opposite to the
timer F/Fj logic level is output from the PDOj pin. An arbitrary value can be set to the timer F/Fj by
TCjCR<TFFj>. Upon reset, the timer F/Fj value is initialized to 0.
To use the programmable divider output, set the output latch of the I/O port to 1.
1
2
3
n-1
n 0
1
n-1
n
2
0
1
2
0
n
?
Internal
Source Clock
Counter
Match detect
Counter clear
Match detect
Counter clear
TC4CR<TC4S>
TTREG4
INTTC4 interrupt request
1
0
2
n-1
n 0
1
2
0
n
?
Counter
Match detect
Counter
clear
n-1
n
2
0
1
Match detect
Counter
clear
TC4CR<TC4S>
TTREG4
INTTC4 interrupt request
TC4 pin input
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