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| 型号： | M38207M8-XXXHP |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 8-BIT, MROM, 4 MHz, MICROCONTROLLER, PQFP80 |
| 封装： | 0.50 MM PITCH, PLASTIC, QFP-80 |
| 文件页数： | 31/69页 |
| 文件大小： | 944K |
| 代理商： | M38207M8-XXXHP |
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Rev.4.01
Nov 14, 2003
page 37 of 136
3803/3804 Group
TIMERS
q8-bit Timers
The 3803/3804 group has four 8-bit timers: timer 1, timer 2, timer
X, and timer Y.
The timer 1 and timer 2 use one prescaler in common, and the
timer X and timer Y use each prescaler. Those are 8-bit
prescalers. Each of the timers and prescalers has a timer latch or
a prescaler latch.
The division ratio of each timer or prescaler is given by 1/(n + 1),
where n is the value in the corresponding timer or prescaler latch.
All timers are down-counters. When the timer reaches “0016”, an
underflow occurs at the next count pulse and the contents of the
corresponding timer latch are reloaded into the timer and the
count is continued. When the timer underflows, the interrupt re-
quest bit corresponding to that timer is set to “1”.
qTimer divider
The divider count source is switched by the main clock division
ratio selection bits of CPU mode register (bits 7 and 6 at address
003B16). When these bits are “00” (high-speed mode) or “01”
(middle-speed mode), XIN is selected. When these bits are“10”
(low-speed mode), XCIN is selected.
qPrescaler 12
The prescaler 12 counts the output of the timer divider. The count
source is selected by the timer 12, X count source selection
register among 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256, 1/512,
1/1024 of f(XIN) or f(XCIN).
Timer 1 and Timer 2
The timer 1 and timer 2 counts the output of prescaler 12 and pe-
riodically set the interrupt request bit.
qPrescaler X and prescaler Y
The prescaler X and prescaler Y count the output of the timer
divider or f(XCIN). The count source is selected by the timer 12, X
count source selection register (address 000E16) and the timer Y,
Z count source selection register (address 000F16) among 1/2,
1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256, 1/512, and 1/1024 of f(XIN)
or f(XCIN); and f(XCIN).
Timer X and Timer Y
The timer X and timer Y can each select one of four operating
modes by setting the timer XY mode register (address 002316).
(1) Timer mode
qMode selection
This mode can be selected by setting “00” to the timer X operating
mode bits (bits 1 and 0) and the timer Y operating mode bits (bits
5 and 4) of the timer XY mode register (address 002316).
qExplanation of operation
The timer count operation is started by setting “0” to the timer X
count stop bit (bit 3) and the timer Y count stop bit (bit 7) of the
timer XY mode register (address 002316).
When the timer reaches “0016”, an underflow occurs at the next
count pulse and the contents of timer latch are reloaded into the
timer and the count is continued.
(2) Pulse output mode
qMode selection
This mode can be selected by setting “01” to the timer X operating
mode bits (bits 1 and 0) and the timer Y operating mode bits (bits
5 and 4) of the timer XY mode register (address 002316).
qExplanation of operation
The operation is the same as the timer mode’s. Moreover the
pulse which is inverted each time the timer underflows is output
from CNTR0/CNTR1 pin. When the CNTR0 active edge switch bit
(bit 2) and the CNTR1 active edge switch bit (bit 6) of the timer XY
mode register (address 002316) is “0”, the output starts with “H”
level. When it is “1”, the output starts with “L” level.
When the value of the CNTR0/CNTR1 active edge switch bit is
changed during pulse output, the output level of the CNTR0/
CNTR1 pin is inverted.
sPrecautions
Set the double-function port of CNTR0/CNTR1 pin and port P54/
P55 to output in this mode.
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