M38039G8HKP datasheet(35/92 Pages) RENESAS

35 / 92 page

Rev.1.10

Nov 14, 2005

Page 35 of 91

REJ03B0166-0110

3803 Group (Spec.H QzROM version)

PRELIMINARY

Notice: This is not a final specification.

Some parametric limits are subject to change.

(4) Pulse period measurement mode

• Mode selection

This mode can be selected by setting “010” to the timer Z

operating mode bits (bits 2 to 0) and setting “0” to the

timer/event counter mode switch bit (b7) of the timer Z mode

• Count source selection

In high- or middle-speed mode, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64,

1/128, 1/256, 1/512 or 1/1024 of f(XIN); or f(XCIN) can be

selected as the count source.

In low-speed mode, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256,

1/512 or 1/1024 of f(XCIN); or f(XCIN) can be selected as the

count source.

• Interrupt

The interrupt at an underflow is the same as the timer mode’s.

When the pulse period measurement is completed, the

INT4/CNTR2 interrupt request bit (bit 5) of the interrupt request

• Explanation of operation

The cycle of the pulse which is input from the CNTR2 pin is

measured. When the CNTR2 active edge switch bit (bit 5) of the

timer Z mode register (address 002A16) is “0”, the timer counts

during the term from one falling edge of CNTR2 pin input to the

next falling edge. When it is “1”, the timer counts during the

term from one rising edge input to the next rising edge input.

When the valid edge of measurement completion/start 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, the timer Z interrupt

request occurs and “FFFF16” is set to the timer. When reading the

timer Z, the value of the timer latch (measured value) is read.

The measured value is retained until the next measurement

completion.

• Precautions

Set the double-function port of CNTR2 pin and port P47 to input

in this mode.

A read-out of timer value is impossible in this mode. The timer

can be written to only during timer stop (no measurement of

pulse period).

Since the timer latch in this mode is specialized for the read-out

of measured values, do not perform any write operation during

measurement.

“FFFF16” is set to the timer when the timer underflows or when

the valid edge of measurement start/completion is detected.

Consequently, the timer value at start of pulse period

measure m ent depends on the timer value just be fore

measurement start.

Figure.28 show s the timing chart of the pulse peri od

measurement mode.

(5) Pulse width measurement mode

• Mode selection

This mode can be selected by setting “011” to the timer Z

operating mode bits (bits 2 to 0) and setting “0” to the

timer/event counter mode switch bit (b7) of the timer Z mode

• Count source selection

In high- or middle-speed mode, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64,

1/128, 1/256, 1/512 or 1/1024 of f(XIN); or f(XCIN) can be

selected as the count source.

In low-speed mode, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256,

1/512 or 1/1024 of f(XCIN); or f(XCIN) can be selected as the

count source.

• Interrupt

The interrupt at an underflow is the same as the timer mode’s.

When the pulse widths measurement is completed, the

INT4/CNTR2 interrupt request bit (bit 5) of the interrupt request

• Explanation of operation

The pulse width which is input from the CNTR2 pin is measured.

When the CNTR2 active edge switch bit (bit 5) of the timer Z

mode register (address 002A16) is “0”, the timer counts during

the term from one rising edge input to the next falling edge input

(“H” term). When it is “1”, the timer counts during the term from

one falling edge of CNTR2 pin input to the next rising edge of

input (“L” term).

When the valid edge of measurement completion is detected, the

1’s complement of the timer value is written to the timer latch.

When the valid edge of measurement completion/start is

detected, “FFFF16” is set to the timer.

When the timer Z underflows, the timer Z interrupt occurs and

“FFFF16” is set to the timer Z. When reading the timer Z, the

value of the timer latch (measured value) is read. The measured

value is retained until the next measurement completion.

• Precautions

Set the double-function port of CNTR2 pin and port P47 to input

in this mode.

A read-out of timer value is impossible in this mode. The timer

can be 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 operation during

measurement.

“FFFF16” is set to the timer when the timer underflows or when

the valid edge of measurement start/completion is detected.

Consequently, the timer value at start of pulse width

measure m ent de pends on the timer value just be fore

measurement start.

Figure.29 shows the timing chart of the pulse width measurement

mode.

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