M38072EC-XXXFS 查看數據表（PDF） - MITSUBISHI ELECTRIC
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M38072EC-XXXFS Datasheet PDF : 74 Pages
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MITSUBISHI MICROCOMPUTERS
3807 Group
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER
sPrecautions
Set the double-function port of CNTR0/CNTR1 pin to output in this
mode.
[During timer operation stop]
The output from CNTR0/CNTR1 pin is initialized to the level set
through CNTR0/CNTR1 active edge switch bit.
[During timer operation enabled]
When the value of the CNTR0/CNTR1 active edge switch bit is writ-
ten over, the output level of CNTR0/CNTR1 pin is inverted.
Figure 20 shows the timing chart of the pulse output mode.
(3) Pulse period measurement mode
• Mode selection
This mode can be selected by setting "010" to the following bits.
Timer X operating mode bit (bits 2 to 0) of TXM
Timer Y operating mode bit (bits 2 to 0) of TYM
• Count source selection
In high- or middle-speed mode, f(XIN)/2 or f(XIN)/16 can be selected
as the count source.
In low-speed mode the count source is f(XCIN).
• Interrupt
The interrupt generation at underflow is the same as already
explained for the timer mode. Bits 0 or 1 of IREQ2 is set to "1"
synchronously to pulse period measurement completion.
• Explanation of operation
[During timer operation stop]
Select the count source. Next, select the interval of the pulse
periods to be measured. When bit 5 of the TXM or TYM is set to
"0", the timer counts during the interval of one falling edge of CNTR0/
CNTR1 pin input until the next falling edge of input. If bits 5 are set
to "1", the timer counts during the interval of one rising edge until
the next rising edge.
[During timer operation enabled]
The pulse period measurement starts by setting bit 0 or 1 of
TXYCON to "0" and the timer counts down from the value that was
set to the timer before the start of measurement. When a valid edge
of measurement start/stop is detected, the 1's complement of the
timer value is written to the timer latch and "FFFF16" is set to the
timer. Furthermore when the timer underflows, a timer X/Y interrupt
request occurs and "FFFF16" is set to the timer. The measured
value is held until the next measurement completion.
sPrecautions
Set the double-function port of CNTR0/CNTR1 pin to input in this
mode.
A read-out of timer value is impossible in this mode. The timer is
written to only during timer stop (no measurement of pulse periods).
Since the timer latch in this mode is specialized for the read-out of
measured values, do not perform any write operations during
measurement.
The timer is set to "FFFF16" when the timer either underflows or a
valid edge of pulse period measurement is detected. Due to that, the
timer value at the start of measurement depends on the timer value
before the start of measurement.
Figure 19 shows the timing chart of the pulse period measurement
mode.
(4) Pulse width measurement mode
• Mode selection
This mode can be selected by setting "011" to the following bits.
Timer X operating mode bit (bits 2 to 0) of TXM
Timer Y operating mode bit (bits 2 to 0) of TYM
• Count source selection
In high- or middle-speed mode, f(XIN)/2 or f(XIN)/16 can be selected
as the count source.
In low-speed mode the count source is f(XCIN).
• Interrupt
The interrupt generation at underflow is the same as already
explained for the timer mode. Bit 0 or 1 of IREQ2 is set to "1" syn-
chronously to pulse width measurement completion.
• Explanation of operation
[During timer operation stop]
Select the count source. Next, select the interval of the pulse widths
to be measured. When bit 5 of TXM or TYM is set to "1", the timer
counts during the interval of one falling edge of CNTR0/CNTR1 pin
input until the next rising edge of input ("L" interval). If bit 5 is set to
"0", the timer counts during the interval of one rising edge until the
next falling edge ("H" interval).
[During timer operation enabled]
The pulse width measurement starts by setting bit 0 or 1 of TXYCON
to "0" and the timer counts down from the value that was set to the
timer before the start of measurement. When a valid edge of
measurement completion is detected, the 1's complement of the
timer value is written to the timer latch and "FFFF16" is set to the
timer. Furthermore when the timer underflows, a timer X/Y interrupt
request occurs and "FFFF16" is set to the timer. The measured
value is held until the next measurement completion.
sPrecautions
Set the double-function port of CNTR0/CNTR1 pin to input in this
mode.
A read-out of timer value is impossible in this mode. The timer is
written to only during timer stop (no measurement of pulse widths).
Since the timer latch in this mode is specialized for the read-out of
measured values, do not perform any write operations during mea-
surement.
The timer value is set to "FFFF16" when the timer either underflows
or a valid edge of pulse widths measurement is detected. Due to
that, the timer value at the start of measurement depends on the
timer value before the start of measurement.
Figure 20 shows the timing chart of the pulse width measurement
mode.
(5) Programmable waveform generation mode
• Mode selection
This mode can be selected by setting "100" to the following bits.
Timer X operating mode bit (bits 2 to 0) of TXM
Timer Y operating mode bit (bits 2 to 0) of TYM
• Count source selection
In high- or middle-speed mode, f(XIN)/2, f(XIN)/16, or f(XCIN) can be
selected as the count source.
In low-speed mode the count source is f(XCIN).
• Interrupt
The interrupt generation at underflow is the same as already
20
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