參數(shù)資料
型號： M37549G3-XXXFP
元件分類： 微控制器/微處理器
英文描述： 8-BIT, MROM, 8 MHz, MICROCONTROLLER, PDSO24
封裝： 5.30 X 10.10 MM, 0.80 MM PITCH, PLASTIC, SSOP-24
文件頁數(shù)： 22/84頁
文件大?。?/td> 1378K
代理商： M37549G3-XXXFP
Rev.2.02
Mar 31, 2009
Page 29 of 81
REJ03B0202-0202
7549 Group
Timer A (TA)
Timer A is a 16-bit timer and counts the signal selected by the
timer A count source selection bit.
The count source of Timer A can be selected from among
φSOURCE/2, /16, /32, /64, /128, /256, low-speed on-ship
oscillator clock, and XCIN input clock.
Timer A counts the selected count source and sets the timer A
interrupt request bit to “1”.
When writing to timer A, the setting value of the timer A write
control bit can be used to select a write to both the timer A latch
and timer or a write to only the timer A latch.
Reading from timer A reads the timer A count value.
Be sure to write to and read from the low-order and the higher
order of timer A in the following order:
Read
Read the high-order of Timer A (TAH) first, and the low-
order of Timer A (TAL) next. Always read both of the
registers.
Write
Write to the low-order of Timer A (TAL) first and the
high-order of Timer A next. Always read both of the
registers.
Counting starts from “FFFF16” after reset.
The division ratio of timer A is 1/(n+1), where n is the timer A
setting value. Timer A stops when the timer A count stop bit is
set to “1”.
Timer A can be used as the timing timer for input capture and
output compare functions.
Notes
(1) Timer Value Setting
When the timer A write control bit is set to “write to only latch”,
written data is written to only to the latch even when the timer is
stopped. To set the initial setting value when the timer is stopped,
select “Write to timer and latch simultaneously” beforehand.
(2) Reading from and Writing to Timer A
If the timer A count source clock and
φSOURCE are different
clocks, timer A cannot be read or written during its counting.
Select the same clock or set timer A to stop counting to enable
read and write operations.
Timer A cannot be read/written in the following conditions:
Timer A count source: XCIN input clock
φSOURCE: Clock other than XCIN input clock
or
Timer A count source: Low-speed on-chip oscillator output
φSOURCE: Clock other than low-speed on-chip oscillator
(3) Count Source of Timer A
The XCIN input clock can be selected as the count source of timer
A only if the 32 kHz quartz crystal oscillator is selected by the
oscillation method selection bit in FSROM1.
Fig 28. Block diagram of timer A
Data bus
Low-speed on-chip
oscillator output
φSOURCE/256
φSOURCE/128
φSOURCE/64
φSOURCE/32
φSOURCE/16
φSOURCE/2
Timer A (low-order) latch (8)
XCIN input clock
(32 kHz quart
crystal oscillator)
Timer A (high-order) latch (8)
Timer A (low-order) (8)
Timer A (high-order) (8)
Timer A write
control bit
Timer A interrupt
request
Compare
Capture
Timer A count
stop bit
Timer A
count source
selection bits
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