参数资料
型号: M34584EDFP
元件分类: 微控制器/微处理器
英文描述: 4-BIT, OTPROM, 6 MHz, MICROCONTROLLER, PDSO42
封装: 0.450 INCH, 0.80 MM PITCH, PLASTIC, SSOP-42
文件页数: 83/157页
文件大小: 1130K
代理商: M34584EDFP
Rev.3.00
2004.08.06
page 31 of 155
REJ03B0010-0300Z
4584 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
TIMERS
The 4584 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 set-
ting 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 reg-
ister, and count continues (auto-reload function).
Fixed dividing frequency timer
The fixed dividing frequency timer has the fixed frequency divid-
ing ratio (n). An interrupt request flag is set to “1” after every n
count of a count pulse.
Fig. 24 Auto-reload function
The 4584 Group timer consists of the following circuits.
Prescaler : 8-bit programmable timer
Timer 1 : 8-bit programmable timer
Timer 2 : 8-bit programmable timer
Timer 3 : 8-bit programmable timer
Timer 4 : 8-bit programmable timer
Watchdog timer : 16-bit fixed dividing frequency timer
(Timers 1, 2, 3, and 4 have the interrupt function, respectively)
Prescaler and timers 1, 2, 3, and 4 can be controlled with the timer
control registers PA, W1 to W6. The watchdog timer is a free
counter which is not controlled with the control register.
Each function is described below.
FF16
n
0016
n : Counter initial value
Count starts
Reload
1st underflow
2nd underflow
n+1 count
Time
An interrupt occurs or
a skip instruction is executed.
Timer interrupt
request flag
T
h
e
c
o
n
te
n
ts
o
f
c
o
u
n
te
r
“1”
“0”
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