參數(shù)資料
型號: M38C34M8MXXXFS
廠商: Mitsubishi Electric Corporation
英文描述: SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
中文描述: 單芯片8位CMOS微機
文件頁數(shù): 21/62頁
文件大?。?/td> 881K
代理商: M38C34M8MXXXFS
21
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
MITSUBISHI MICROCOMPUTERS
38C3 Group
t
s
Timer 6
count source
n
ts
m
ts
(n+m)
ts
Note:
PWM waveform (duty : n/(n+m) and period : (n+m)
ts) is output.
n: setting value of Timer 6
m: setting value of Timer 6 PWM register
ts: period of Timer 6 count source
Timer 6 interrupt request
Timer 6 interrupt request
Timer 6
PWM mode
Fig. 18 Timing chart of timer 6 PWM
1
mode
16-bit Timer
Timer A is a 16-bit timer that can be selected in one of four modes by
the timer A mode register and the timer A control register.
G
Timer A
The timer A operates as down-count. When the timer contents reach
“0000
16
”, an underflow occurs at the next count pulse and the timer
latch contents are reloaded. After that, the timer continues count-
down. When the timer underflows, the interrupt request bit correspond-
ing to the timer A is set to “1”.
(1) Timer mode
The count source can be selected by setting the timer A mode regis-
ter.
(2) Pulse output mode
Pulses of which polarity is inverted each time the timer underflows
are output from the TA
OUT
pin. Except for that, this mode operates
just as in the timer mode.
When using this mode, set port P5
0
sharing the TA
OUT
pin to output
mode.
(3) IGBT output mode
After dummy output from the TA
OUT
pin, count starts with the INT
0
pin input as a trigger. When the trigger is detected or the timer A
underflows, “H” is output from the the TA
OUT
pin.
When the count value corresponds with the compare register value,
the TA
OUT
output becomes “L”. When the INT
0
signal becomes “H”,
the TA
OUT
output is forced to become “L”.
After noise is cleared by noise filters, judging continuous 4-time same
levels with sampling clocks to be signals, the INT
0
signal can use 4
types of delay time by a delay circuit.
When using this mode, set port P5
5
sharing the INT
0
pin to input
mode and set port P5
0
sharing the TA
OUT
pin to output mode.
It is possible to force the timer A output to be “L” using pins INT
1
and
INT
2
by the timer A control register.
(4) PWM mode
IGBT dummy output, an external trigger with the INT
0
pin and output
control with pins INT
1
and INT
2
are not used. Except for those, this
mode operates just as in the IGBT output mode.
The period of PWM waveform is specified by the timer A set value.
The “H” term is specified by the compare register set value.
When using this mode, set port P5
0
sharing the TA
OUT
pin to output
mode.
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