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參數(shù)資料
| 型號： | M38037M8H-XXXWG |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 8.4 MHz, MICROCONTROLLER, PBGA64 |
| 封裝： | 6 X 6 MM, 0.65 MM PITCH, PLASTIC, FLGA-64 |
| 文件頁數(shù)： | 41/111頁 |
| 文件大小： | 1205K |
| 代理商： | M38037M8H-XXXWG |
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Rev.3.02
Nov 05, 2004
page 35 of 108
3803 Group (Spec. H)
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
(4) Pulse period measurement mode
qMode selection
This mode can be selected by setting “010” to the timer Z operat-
ing mode bits (bits 2 to 0) and setting “0” to the timer/event
counter mode switch bit (b7) of the timer Z mode register (address
002A16).
qCount 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.
qInterrupt
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 register
2 (address 003D16) is set to “1”.
qExplanation of operation
The cycle of the pulse which is input from the CNTR2 pin is mea-
sured. 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 fall-
ing 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 re-
quest 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 comple-
tion.
sPrecautions
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 pe-
riod).
Since the timer latch in this mode is specialized for the read-out of
measured values, do not perform any write operation during mea-
surement.
“FFFF16” is set to the timer when the timer underflows or when the
valid edge of measurement start/completion is detected. Conse-
quently, the timer value at start of pulse period measurement
depends on the timer value just before measurement start.
Figure 29 shows the timing chart of the pulse period measurement
mode.
(5) Pulse width measurement mode
qMode selection
This mode can be selected by setting “011” to the timer Z operat-
ing mode bits (bits 2 to 0) and setting “0” to the timer/event
counter mode switch bit (b7) of the timer Z mode register (address
002A16).
qCount 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.
qInterrupt
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 register
2 (address 003D16) is set to “1”.
qExplanation 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.
sPrecautions
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 mea-
surement.
“FFFF16” is set to the timer when the timer underflows or when the
valid edge of measurement start/completion is detected. Conse-
quently, the timer value at start of pulse width measurement
depends on the timer value just before measurement start.
Figure 30 shows the timing chart of the pulse width measurement
mode.
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