參數(shù)資料
型號(hào)： M38D29GC-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, FLASH, 6.25 MHz, MICROCONTROLLER, PQFP64
封裝： 14 X 14 MM, 0.80 MM PITCH, PLASTIC, LQFP-64
文件頁數(shù)： 75/138頁
文件大?。?/td> 2880K
代理商： M38D29GC-XXXFP
Rev.3.02
Apr 10, 2008
Page 39 of 131
REJ03B0177-0302
38D2 Group
<Notes on Timer Y>
CNTR1 Interrupt Active Edge Selection
CNTR1 interrupt active edge depends on the CNTR1 active edge
switch bit. However, in pulse width HL continuously
measurement mode, CNTR1 interrupt request is generated at
both rising and falling edges of CNTR1 pin input signal
regardless of the setting of CNTR1 active edge switch bit.
Timer Y Read/Write Control
When reading from/writing to timer Y, read from/write to both
the high-order and low-order bytes of timer Y. When the value
is read, read the high-order bytes first and the low-order bytes
next. When the value is written, write the low-order bytes first
and the highorder bytes next.
Write to or read from the timer X register in 16-bit units. If
reading from the timer Y register during write operation or
writing to it during read operation is performed, normal
operation will not be performed.
Which write control can be selected by the timer Y write
control bit (b0) of the timer Y control register (address
003916), writing data to both the latch and the timer at the
same time or writing data only to the latch. When writing a
value to the timer Y address to write to the latch only, the
value is set into the reload latch and the timer is updated at the
next underflow. After reset release, when writing a value to the
timer Y address, the value is set into the timer and the timer
latch at the same time, because they are set to write at the same
time.
When writing to the latch only, if the write timing to the high-
order reload latch and the underflow timing are almost the
same, the value is set into the timer and the timer latch at the
same time. In this time, counting is stopped during writing to
the high-order reload latch.
This also applies when the frequency divider output is selected
as the timer count source and the count source is switched in
conjunction with a transition between operating modes (on-
chip oscillator mode, XIN mode, or low-speed mode). Be
careful when changing settings in the CPU mode register.
Fig. 30 Structure of timer Y related registers
b7
b0
Timer Y control register
(TYCON: address 003916)
Timer Y write control bit
0 : Write data to both timer latch and timer
1 : Write data to timer latch only
Timer Y count source selection bit
0 : Frequency divider output
1 : f(XCIN)
Timer Y frequency division selection bits
b3 b2
0 0 : 1/16
× φSOURCE
0 1 : 1/1
× φSOURCE
1 0 : 1/2
× φSOURCE
1 1 : 1/256
× φSOURCE
Not used (returns “0” when read)
φ SOURCE: represents the supply source of internal clock φ.
XIN input: in the frequency/2, 4 or 8 mode,
Internal on-chip oscillator divided by 4 in the on-chip
oscillator mode, and Sub clock in the low-speed mode.
Real time port control bits (P46, P47 )
b1 b0
0 0 : Real time port function invalid
0 1 : Do not set
1 0 : Do not set
1 1 : Real time port function valid
P46 data for real time port
P47 data for real time port
Timer Y operating mode bits
b5 b4
0 0 : Timer mode
0 1 : Period measurement mode
1 0 : Event counter mode
1 1 : Pulse width HL continuous measurement mode
CNTR1 active edge switch bit
0 : Count at rising edge in event counter mode
Measure falling period in period measurement mode
Falling edge active for CNTR1 interrupt
1 : Count at falling edge in event counter mode
Measure rising period in period measurement mode
Rising edge active for CNTR1 interrupt
Timer Y count stop bit
0 : Count operation
1 : Count stop
Timer Y mode register
(TYM: address 003816)
b0
b7
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