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| 型號： | HMS99C58S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH |
| 中文描述： | 8位單片機(jī)與嵌入式閃存微控制器 |
| 文件頁數(shù)： | 30/73頁 |
| 文件大?。?/td> | 696K |
| 代理商： | HMS99C58S |
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HMS99C51S/52S/54S/56S/58S
26
Sep. 2004 Ver 1.01
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).
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).
Table 10. Power Saving Modes Overview
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