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參數(shù)資料
| 型號： | M37560MF-XXXGP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PQFP100 |
| 封裝： | 14 X 14 MM, 0.50 MM PITCH, PLASTIC, LQFP-100 |
| 文件頁數(shù)： | 26/90頁 |
| 文件大?。?/td> | 1682K |
| 代理商： | M37560MF-XXXGP |
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SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
7560 Group
31
Timer 1, Timer 2, Timer 3
Timer 1, timer 2, and timer 3 are 8-bit timers and is equipped with
the timer latch. The count source for each timer can be selected
by the timer 123 mode register.
The division ratio of each timer is given by 1/(n+1), where n is the
value in the timer latch. All timers are down-counters. When the
contents of the timer reach “0016”, an underflow occurs at the next
count pulse and the contents of the timer latch are reloaded into
the timer and the count is continued. When the timer underflows,
the interrupt request bit corresponding to that timer is set to “1”.
When a value is written to the timer 1 register and the timer 3 reg-
ister, a value is simultaneously set as the timer latch and the timer.
When the timer 1 register, the timer 2 register, or the timer 3 regis-
ter is read, the count value of the timer can be read.
qTimer 2 Write Control
Which write can be selected by the timer 2 write control bit (bit 2)
of the timer 123 mode register (address 002916), writing data to
both the latch and the timer at the same time or writing data only
to the latch. When the operation “writing data only to the latch” is
selected, the value is set to the timer 2 latch by writing data to the
timer 2 register and the timer 2 is updated at next underflow. After
reset, the operation “writing data to both the latch and the timer at
the same time” is selected, and the value is set to both the timer 2
latch and the timer 2 at the same time by writing data to the timer
2 register.
If the value is written in latch only, a value is simultaneously set to
the timer 2 and the timer 2 latch when the writing in the high-
order register and the underflow of timer 2 are performed at the
same timing.
qTimer 2 Output Control
When the timer 2 (TOUT) output is enabled by the TOUT/
φ output
enable bit and the TOUT/
φ output selection bit, an inversion signal
from the TOUT pin is output each time timer 2 underflows.
In this case, set the P43/
φ/TOUT pin to output mode (set “1” to bit 3
of port P4 direction register).
sNote on Timer 1 to Timer 3
When the count source of timers 1 to 3 is changed, the timer
counting value may become arbitrary value because a thin pulse
is generated in count input of timer. If timer 1 output is selected as
the count source of timer 2 or timer 3, when timer 1 is written, the
counting value of timer 2 or timer 3 may become undefined value
because a thin pulse is generated in timer 1 output.
Therefore, set the value of timer in the order of timer 1, timer 2
and timer 3 after the count source selection of timer 1 to 3.
Fig. 27 Structure of timer 123 mode register
TOUT output active edge switch bit
0 : Start at “H” output
1 : Start at “L” output
TOUT/
φ output enablel bit
0 : TOUT/
φ output disabled
1 : TOUT/
φ output enabled
Timer 2 write control bit
0 : Write data in latch and counter
1 : Write data in latch only
Timer 2 count source selection bit
0 : Timer 1 output signal
1 : f(XIN)/16
(or f(XCIN)/16 in low-speed mode)
Timer 3 count source selection bit
0 : Timer 1 output signal
1 : f(XIN)/16
(or f(XCIN)/16 in low-speed mode)
Timer 1 count source selection bit
0 : f(XIN)/16
(or f(XCIN)/16 in low-speed mode)
1 : f(XCIN)
Not used (“0” at reading)
Timer 123 mode register
(T123M :address 002916)
Note: System clock
φ is f(XCIN)/2 in the low-speed mode.
b7
b0
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