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参数资料
型号： M38D29FFFP
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
封装： 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件页数： 62/136页
文件大小： 2856K
代理商： M38D29FFFP
Rev.3.02
Apr 10, 2008
Page 31 of 131
REJ03B0177-0302
38D2 Group
TIMERS
8-Bit Timer
The 38D2 Group has four built-in 8-bit timers: timer 1, timer 2,
timer 3, and timer 4.
Each timer has the 8-bit timer latch. All timers are down-
counters.
When the timer reaches “0016”, the contents of the timer latch is
reloaded into the timer with the next count pulse. In this mode,
the interrupt request bit corresponding to that timer is set to “1”.
The count can be stopped by setting the stop bit of each timer to
“1”.
Fig. 23 Timer 1-4 block diagram
Timer 1 latch (8)
Timer 1 (8)
Timer 2 latch (8)
Timer 2 (8)
Timer 3 latch (8)
Timer 3 (8)
Timer 4 latch (8)
Timer 4 (8)
Timer 1 interrupt request
Timer 2 interrupt request
Timer 3 interrupt request
Timer 4 interrupt request
XCIN
Data bus
Timer 1 count stop bit
10 bit
PWM1
circuit
1/2
Q
S
T
Timer 4 operating
mode selection bit
T4OUT output
edge switch bit
P53
latch
Timer 4 output selection bit
P53 direction
register
P53/PWM1/
T4OUT
10 bit
PWM0
circuit
1/2
Q
S
T
Timer 3 operating
mode selection bit
T3OUT output
edge switch bit
P52
latch
Timer 3 output selection bit
P52 direction
register
P52/PWM0/
T3OUT
“00”
“01”
“10”
“00”
“01”
“1”
“0”
“01”
“10”
“00”
“0”
“1”
“0”
“1”
“0”
Clock for
timer 1
Clock for
timer 2
Clock for
timer 3
Clock for
timer 4
Timer 1
Timer 2
Timer 3
Timer 4
Frequency division
selection bits
(2 bits for each timer)
C
lo
ck
fo
r
tim
e
r
1
C
lo
ck
fo
r
tim
e
r
2
C
lo
ck
fo
r
tim
e
r
3
C
lo
ck
fo
r
tim
e
r
4
8
The following values can be selected
the clock for timer;
1/1,1/2,1/16,1/256
Frequency divider
1/2
Q
S
T
T2OUT output
edge switch bit
Timer 2 output selection bit
“0”
“1”
P36 direction
register
P36/T2OUT/CKOUT
P36
latch
Timer 2 output selection bit
P36 clock output
control bit
System clock
φ
“1”
“0”
“10”
Timer Y
output
Timer 3 write control bit
PWM01 register (2)
Timer 4 write control bit
Timer 2 write control bit
Timer 1 count
source selection
bits
Timer 2 count
source selection
bits
Timer 2 count stop bit
Timer 3 count source
selection bit
Timer 3 count stop bit
Timer 4 count source
selection bits
Timer 4 count stop bit
Timer 4 output selection bit
φ SOURCE
φ SOURCE: represents the oscillation frequency of
XIN input in the frequency/2, 4 or 8 mode,
on-chip oscillator divided by 4 in the on-chip
oscillator mode,
and sub-clock in the low-speed mode.
“11”
f(XIN)
(Note)
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