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| 型號(hào)： | μPD753018A |
| 廠商： | NEC Corp. |
| 英文描述： | 4-Bit Single Chip Microcontroller(4位單片微控制器) |
| 中文描述： | 4位單片微控制器（4位單片微控制器） |
| 文件頁數(shù)： | 156/442頁 |
| 文件大?。?/td> | 1588K |
| 代理商： | ΜPD753018A |
CHAPTER 5 PERIPHERAL HARDWARE FUNCTION
134
(3) Timer/event counter operation
The timer/event counter operates as follows. To perform this operation, clear the gate control enable flag
(TGCE) of the timer/event counter control register (TC2) to 0.
Fig. 5-38 shows the configuration when the timer/event counter operates.
<1>
<2>
The count pulse (CP) is selected by the mode register (TMn) and is input to the count register (Tn).
The contents of Tn are compared with those of the modulo register (TMODn). When the contents of
these registers coincide, a coincidence signal is generated, and the interrupt request flag (IRQTn) is
set. At the same time, the timer out flip/flop (TOUT F/F) is inverted.
Fig. 5-39 shows the timing of the timer/event counter operation.
The timer/event counter operation is usually started in the following procedure:
<1>
<2>
Set the number of counts to TMODn.
Sets the operation mode, count pulse, and start command to TMn.
Caution Do not set a value other than 00H to the modulo register (TMODn).
To use the timer/event counter output pin (PTOn), set the P2n pin as follows:
<1>
<2>
<3>
<4>
Clear the output latch of P2n.
Set port 2 in the output mode.
Disconnect the internal pull-up resistor from port 2 (When outputting PTO2, disable PCL output).
Set the timer/event counter output enable flag (TOEn) to 1.
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