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| 型号： | 7549 |
| 厂商： | Renesas Technology Corp. |
| 英文描述： | SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 中文描述： | 单芯片8位CMOS微机 |
| 文件页数： | 26/73页 |
| 文件大小： | 1272K |
| 代理商： | 7549 |
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Rev.2.00
REJ03B0202-0200
Mar 05, 2007
Page 26 of 70
7549 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
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
φ
SOURCE/2, /16, /32, /64, /128, /256, low-speed on-ship
oscillator clock, and X
CIN
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 “FFFF
16
” 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 on Timer A
(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
φ
SOURCE 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: X
CIN
input clock
φ
SOURCE: Clock other than X
CIN
input clock
or
Timer A count source: Low-speed on-chip oscillator output
φ
SOURCE: Clock other than low-speed on-chip oscillator
(3) Count Source of Timer A
The X
CIN
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 25. Block diagram of timer A
Data bus
Low-speed on-chip
oscillator output
φ
SOURCE/256
φ
SOURCE/128
φ
SOURCE/64
φ
SOURCE/32
φ
SOURCE/16
φ
SOURCE/2
Timer A (low-order) latch (8)
X
CIN
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
相关PDF资料 |
PDF描述 |
|---|---|
| 75HQ | SCHOTTKY RECTIFIER |
| 75HQ030 | SCHOTTKY RECTIFIER |
| 75HQ035 | SCHOTTKY RECTIFIER |
| 75HQ040 | SCHOTTKY RECTIFIER |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 7549_0710 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7549_09 | 制造商:RENESAS 制造商全称:Renesas Technology Corp 功能描述:SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER |
| 7-5-4905 | 功能描述:3M 4905 VHB TAPE SPECIALTY TAPES 制造商:3m (tc) 系列:VHB?? 4905 零件状态:在售 厚度 - 粘合剂:- 厚度 - 底布，载体:- 标准包装:1 |
| 754905-1 | 功能描述:PIN ATT/ROLL AUTO IV 制造商:te connectivity amp connectors 系列:* 零件状态:有效 标准包装:1 |
| 7-5-4910 | 功能描述:3M 4910 VHB TAPE SPECIALTY TAPES 制造商:3m (tc) 系列:VHB?? 4910 零件状态:在售 底布，载体:丙烯酸泡棉 厚度 - 粘合剂:- 厚度 - 底布，载体:- 标准包装:1 |
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