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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： | 46/73页 |
| 文件大小： | 1272K |
| 代理商： | 7549 |
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Rev.2.00
REJ03B0202-0200
Mar 05, 2007
Page 46 of 70
7549 Group
PRELIMINARY
Notice: This is not a final specification.
Some parametric limits are subject to change.
Stop mode
When the STP instruction is executed, the internal clock
φ
stops
at an “H” level and the X
IN
/X
CIN
and on-chip oscillator stops. At
this time, timer 1 is set to “01
16
” and prescaler 12 is set to “FF
16
”
when the oscillation stabilization time set bit after release of the
STP instruction is “0”. On the other hand, timer 1 and prescaler
12 are not set when the above bit is “1”. Accordingly, set the wait
time fit for the oscillation stabilization time of the oscillator to be
used. When an external interrupt is accepted, oscillation is
restarted but the internal clock
φ
remains at “H” until timer 1
underflows. As soon as timer 1 underflows, the internal clock
φ
is supplied. This is because when a ceramic resonator is used,
some time is required until a start of oscillation. In case
oscillation is restarted by reset, no wait time is generated. So
apply an “L” level to the RESET pin while oscillation becomes
stable, or set the wait time by on-chip oscillator operation after
system is released from reset until the oscillation is stabled.
Wait mode
If the WIT instruction is executed, the internal clock
φ
stops at an
“H” level, but the oscillator does not stop. The internal clock
restarts if a reset occurs or when an interrupt is received. Since
the oscillator does not stop, normal operation can be started
immediately after the clock is restarted. To ensure that interrupts
will be received to release the STP or WIT state, interrupt enable
bits must be set to “1” before the STP or WIT instruction is
executed.
Note on Oscillation Control
For use with the oscillation stabilization set bit after release of
the STP instruction set to “1”, set values in timer 1 and prescaler
12 after fully appreciating the oscillation stabilization time of the
oscillator to be used.
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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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