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參數(shù)資料
| 型號： | 6P8B |
| 廠商： | NEC Corp. |
| 英文描述： | MOS INTEGRATED CIRCUIT 4-BIT SINGLE-CHIP MICROCONTROLLER FOR INFRARED REMOTE CONTROL TRANSMISSION |
| 中文描述： | 馬鞍山集成電路4位單片機的紅外遙控傳輸 |
| 文件頁數(shù)： | 27/95頁 |
| 文件大?。?/td> | 692K |
| 代理商： | 6P8B |
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27
μ
PD6P8, 6P8A, 6P8B
Data Sheet U17848EJ3V0DS
5.2 Timer Operation
The timer starts (counting down) when a value other than 0 is set for the down counter with a timer manipulation
instruction. The timer manipulation instructions for making the timer start operation are shown below:
MOV T0, A
MOV T1, A
MOV T, #data10
MOV T, @R0
The down counter is decremented (–1) in the cycle of 64/f
X
. If the value of the down counter becomes 0, the
zero detector generates the timer operation end signal to stop the timer operation. At this time, if the timer is in
HALT mode (HALT #
×
101B) waiting for the timer to stop its operation, the HALT mode is released and the instruction
following the HALT instruction is executed. The output of the timer operation end signal is continued while the down
counter is 0 and the timer is stopped. The following relational expression applies between the timer’s output time
and the down counter’s set value.
Timer output time = (Set value + 1)
×
64/f
X
– 4/f
X
In addition, when the timer is set successively, the timer output time is also 4/f
X
shorter than the total time. An
example is shown below.
Example
When f
X
= 4 MHz
MOV T, #3FFH
STTS #05H
HALT #05H
MOV T, #232H
STTS #05H
HALT #05H
In the case above, the timer output time is as follows.
(Set value + 1)
×
64/f
X
+ (Set value + 1)
×
64/f
X
– 4/f
X
= (511 + 1)
×
64/4 + (50 + 1)
×
64/4 – 4/4
= 9.007 ms
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