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| 型號(hào)： | Q67127-C1031 |
| 廠商： | SIEMENS AG |
| 元件分類： | 8位微控制器 |
| 英文描述： | 8-Bit CMOS Microcontroller |
| 中文描述： | 8位CMOS微控制器 |
| 文件頁數(shù)： | 24/48頁 |
| 文件大小： | 319K |
| 代理商： | Q67127-C1031 |
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C501
Semiconductor Group
24
1997-04-01
Power Saving Modes
Two power down modes are available, the Idle Mode and Power Down Mode.
The bits PDE and IDLE of the register PCON select the Power Down mode or the Idle mode,
respectively. If the Power Down mode and the Idle mode are set at the same time, the Power Down
mode takes precedence.
Table 10
gives a general overview of the power saving modes.
In the Power Down mode of operation,
V
CC
can be reduced to minimize power consumption. It must
be ensured, however, that
V
CC
is not reduced before the Power Down mode is invoked, and that
V
CC
is restored to its normal operating level, before the Power Down mode is terminated. The reset
signal that terminates the Power Down mode also restarts the oscillator. The reset should not be
activated before
V
CC
is restored to its normal operating level and must be held active long enough
to allow the oscillator to restart and stabilize (similar to power-on reset).
Table 10
Power Saving Modes Overview
Mode
Entering
Instruction
Example
Leaving by
Remarks
Idle mode
ORL PCON, #01H
– enabled interrupt
– Hardware Reset
CPU is gated off
CPU status registers maintain
their data.
Peripherals are active
Power-Down
Mode
ORL PCON, #02H
Hardware Reset
Oscillator is stopped, contents
of on-chip RAM and SFR’s are
maintained (leaving Power
Down Mode means redefinition
of SFR contents).
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