參數(shù)資料
型號: M3455AGC-XXXFP
元件分類: 微控制器/微處理器
英文描述: 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PQFP52
封裝: 10 X 10 MM, 0.65 MM PITCH, PLASTIC, LQFP-52
文件頁數(shù): 73/148頁
文件大?。?/td> 1807K
代理商: M3455AGC-XXXFP
Rev.1.02
Nov 26, 2008
Page 30 of 146
REJ03B0224-0102
455A Group
TIMERS
The 455A 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 32. 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
Th
e
cont
en
ts
of
cou
n
te
r
Timer interrupt
request flag
Count starts
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