M38072M4-XXXFP 查看數據表（PDF） - MITSUBISHI ELECTRIC

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M38072M4-XXXFP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

MITSUBISHI MICROCOMPUTERS

3807 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

explained for the timer mode.

• Explanation of operation

Counting operation is the same as in timer mode. Moreover the

timer outputs the data set in the corresponding output level latch

(bit 4 of TXM or TYM) to CNTR0/CNTR1 pin each time the timer

underflows. After the timer underflows, the generation of optional

waveform from CNTR0/CNTR1 pin is possible through a change of

values in the output level latch and timer latch.

sPrecautions

Set the double-function port of CNTR0/CNTR1 pin to output in this

mode.

Figure 23 shows the timing chart of the programmable waveform

generation mode.

(6) Programmable one-shot generating mode

• Mode selection

This mode can be selected by setting "101" 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.

• Interrupt

The interrupt generation at underflow is the same as already

explained for the timer mode. The one-shot generating trigger

condition must be set to the INT0 interrupt edge selection bit (b0)

and INT1 interrupt edge selection bit (b1) of INTEDGE. Setting these

bits to "0" causes the interrupt request being

triggered by a falling edge, setting them to "1" causes the interrupt

request being triggered by a rising edge. The INT0 interrupt request

bit (b0) and INT1 interrupt request bit (b1) of IREQ1 are set to "1" by

detecting the active edge of the INT pin.

• Explanation of operation

For a "H" one-shot pulse, set bit 5 of TXM, TYM to "0".

[During timer operation stop]

The output level of CNTR0/CNTR1 pin is initialized to "L" at mode

selection. Set the one-shot pulse width to TXH, TXL, TYH, TYL. A

trigger generation during timer stop (input signal to INT0/INT1 pin)

is invalid.

[During timer operation enabled]

When a trigger generation is detected, "H" is output, and at underflow

"L" is output from CNTR0/CNTR1 pin.

For a "L" one-shot pulse set bit 5 of TXM, TYM to "1".

[During timer operation stop]

The output level of CNTR0/CNTR1 pin is initialized to "H" at mode

selection. Set the one-shot pulse width to TXH, TXL, TYH, TYL. A

trigger generation during timer stop (input signal to INT0/INT1 pin)

is invalid.

[During timer operation enabled]

When a trigger generation is detected, "L" is output, and at underflow

"H" is output from CNTR0/CNTR1 pin.

sPrecautions

• Set the double-function port of CNTR0/CNTR1 pin to output and the

double-function port of INT0/INT1 pin to input in this mode.

• This mode is unused in low-speed mode.

• During one-shot generation permission or one-shot generation the

output level from CNTR0/CNTR1 pin changes if the value of the

CNTR0/CNTR1 active edge switch bit is inverted.

Figure 24 shows the timing chart of the programmable one-shot

generating mode.

(7) PWM mode

• Mode selection

This mode can be selected by setting "110" 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.

• Interrupt

With a rising edge of CNTR0/CNTR1 output, the timer X interrupt

request bit (b4) and timer Y interrupt request bit (b5) of IREQ1 are

set to "1".

• Explanation of operation

PWM waveform is output from CNTR0 pin (in case of timer X) or

from CNTR1 pin (in case of timer Y).

The "H" interval of PWM waveform is determined by the setting

value m (m=0 to 255) of TXH and TYH and the "L" interval of PWM

waveform is determined by the setting value n (n=0 to 255) of TXL

and TYL.

The PWM cycles are:

PWM cycle time = (m+n)·ts

PWM duty = m/(m+n)

where: ts: period of timer X/timer Y count source

[During count operation stop]

When a timer value is set to TXL, TXH, TYL, TYH by writing data to

timer and timer latch at the same time. When setting this value, the

output of CNTR0/CNTR1 pin is initialized to the "H" level.

[During count operation enabled]

By setting the bit 0 or 1 of TXYCON to "0", an "H" interval of TXH or

TYH is output first, and after that a "L" level interval of TXL or TYL

are output next. These operations are repeated continuously. The

PWM output is changed after the underflow by setting a timer value,

which is set by writing data to the timer latch only, to TXL, TXH,

TYL, TYH.

sPrecautions

• Set the double-function port of CNTR0/CNTR1 pin to output in this

mode.

• This mode is unused in low-speed mode.

• When the PWM "H" interval is set to "0016", PWM output is "L".

• When the PWM "L" interval is set to "0016", PWM output is "H".

• When the PWM "H" interval and "L" interval are set to "0016", PWM

output is "L".

• When a PWM "H" interval or "L" interval is set to "0016" at least for

a short time, timer X/timer Y interrupt request does not occur.

• When the value set to the timer latch is "0016", the value is unde-

fined since the timer counts down by dummy count operation.

Figure 23 shows the timing chart of the PWM mode.

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