参数资料
型号: M37481M8T-XXXSP
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PDIP42
封装: 0.600 INCH, 1.78 MM PITCH, SHRINK, PLASTIC, DIP-42
文件页数: 28/100页
文件大小: 1457K
代理商: M37481M8T-XXXSP
MITSUBISHI MICROCOMPUTERS
7480/7481 GROUP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
30
PRELIMINAR
Y
Notice:
This
is not
a final
specification.
Some
parametric
limits
are
subject
to change.
(1) Timer Mode
The frequency of f(XIN)/8, f(XIN)/64, f(XIN)/128 or f(XIN)/256 is
counted.
(2) Programmable Waveform Generation Mode
This operation is the same as the timer mode, except that a timer
outputs the level of the value set in the output level latch of the
timer 1 mode register/timer 2 mode register from the T0 or T1 pin
each time a timer underflows.
After the timer underflows, the timer can output an optional wave-
form from the T0 or T1 pin if the values of the output level latch and
timer latch are changed.
In this mode, set the port in common with the T0/T1 pin as an out-
put port.
Fig. 26 Block diagram of timer 1, timer 2
q Timers 1 and 2
Timer 1 and timer 2 are the 8-bit timers. They can select the fol-
lowing 2 modes by setting timer 1 mode register and timer 2 mode
register.
Timer mode
Programmable waveform generation mode
When the count source is changed, set it again as the timer value
may go wrong.
Fig. 27 Structure of timer 1/timer 2 mode register
Timer stop control bit
0 : Count operation
1 : Count stop
Timer 1 mode register (T1M : address 00F9 16)
Timer 2 mode register (T2M : address 00FA 16)
b7
b0
Timer operation mode bit
0 : Timer mode
1 : Programmable waveform generation mode
Output level latch
0 : “L” output
1 : “H” output
Timer count source selection bits
b7 b6
0
0 : f(XIN)/8
0
1 : f(XIN)/64
1
0 : f(XIN)/128
1
1 : f(XIN)/256
Not used (“0” at read)
Timer mode register
Count stop
control bit
f(XIN)/8
Timer interrupt
request bit
8
T
TL
8
Data bus
f(XIN)/64
f(XIN)/128
f(XIN)/256
Output
level latch
T
D
Q
Timer count source
selection bits
“00”
“01”
“10”
“11”
T0, T1 output
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