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參數資料
| 型號： | EM78612 |
| 英文描述： | Dual Advanced Synchronous Rectified Buck MOSFET Drivers with Pre-POR OVP; Temperature Range: -40°C to 85°C; Package: 16-QFN |
| 中文描述： | USB控制器 |
| 文件頁數： | 16/29頁 |
| 文件大?。?/td> | 692K |
| 代理商： | EM78612 |
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EM78612
Universal Serial Bus Microcontroller Series
This specification may change without further notice.
23
3/5/2003 (V1.0)
8.6
Power Saving Mode
The EM78612 provides two options of power saving modes for energy conservation, i.e.,
Power Down mode, and Dual Clock mode.
8.6.1 Power Down Mode
The EM78612 enters into Power Down mode by clearing the RUN register (IOCE[4]). During
this mode, the oscillator is turned off and the MCU goes to sleep. It will wake up when signal
from USB host is resumed, or when the WatchDog resets, or the input port state changes.
If the MCU wakes up when I/O port status changes, I/O port direction should be set at input,
then the port state is read. For example:
:
// Set the Port 6 to input port
MOV
A , 0XFF
IOW
PORT6
// Read the state of Port 6
MOV
PORT6, PORT6
// Clear the RUN bit
IOR
0XE
AND
A , 0B11101111
IOW
0XE
:
If the MCU is awaken by a USB Resume signal, the next instruction will be executed, and
one flag, RC[3] will be set to 1.
8.6.2 Dual Clock Mode
The EM78612 has one internal oscillator for power saving application. Clearing the Bit IOCE
[7] will enable the low frequency oscillator. At the same time, the external oscillator will be
turned off. Then the MCU will run under very low frequency to conserve power. Four types of
frequency are available for selection in setting Bits IOCA [6, 7].
The USB Host Resume Interrupt can only be used in this mode. If this interrupt is enabled,
the MCU will be interrupted when the USB Suspend signal is detected on USB Bus.
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