參數(shù)資料
型號: 4571
廠商: Renesas Technology Corp.
英文描述: SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
中文描述: 單芯片4位微機(jī)的CMOS
文件頁數(shù): 46/126頁
文件大?。?/td> 1627K
代理商: 4571
Rev.1.02
May 25, 2007
Page 26 of 124
REJ03B0179-0102
4571 Group
TIMERS
The 4571 Group has the following timers.
Programmable timer
The programmable timer has a reload register and enables the
frequency dividing ratio to be set. It is decremented from a
setting value n. When it underflows (count to n + 1), a timer
interrupt request flag is set to “1,” new data is loaded from the
reload register, and count continues (auto-reload function).
Fixed dividing frequency timer
The fixed dividing frequency timer has the fixed frequency
dividing ratio (n). An interrupt request flag is set to “1” after
every n count of a count pulse.
Fig 30. Auto-reload function
n+1 count
Reload
n+1 count
An interrupt occurs or
a skip instruction is executed.
1st underflow
Reload
2nd underflow
FF16
Time
n
0016
“1”
“0”
n : Counter initial value
T
h
e
c
ont
en
ts
of
cou
n
te
r
Timer interrupt
request flag
Count starts
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