參數(shù)資料
型號： M37640E8
廠商： Mitsubishi Electric Corporation
英文描述： SINGLE-CHIP 8-BIT CMOS MICROCONTROLLER
中文描述： 單芯片8位CMOS單片機(jī)
文件頁數(shù)： 147/172頁
文件大?。?/td> 1193K
代理商： M37640E8
7600 Series
Mitsubishi Microcomputer
M37640E8-XXXF Preliminary Specification
Using the Frequency Synthesizer and DC-DC Converter
8/10/98
4-11
Change the DC-DC converter from high current mode to low current mode by setting USBC3 (bit
3 of the USBC) to a “1”.
Perform other tasks to reduce total current to below 500uA.
Execute the STP instruction. Make sure to enable the USB Suspend/Resume Signaling Interrupt
Enable Bit (bit 7 of USBIE2 = “1”), the USB Function Interrupt (bit 0 of IREQA = “1”) and
clear the I flag prior to executing the STP instruction so the MCU can wake up once resume sig-
naling is detected.
Note that no action may be necessary if the device is self powered.
4.6.2.4
Set up after USB Resume Signaling Detected
A resume occurs when the USB FCU is in the suspend state and detects non-idle signaling on D+/D-.
Detection of a resume results in bit 6 of USBIS2 being set to a “1”. If bit 7 of USBIE2 is a “1”, a
USB Function Interrupt request is also generated. If the MCU was in the stop state prior to the
detection of the resume, the USB Function Interrupt request will cause the MCU to wake up from the
stop state. See section 2.16.1 “Stop Mode” for details on waking up from the stop state.
The configuration of the frequency synthesizer and DC-DC converter should be changed as follows in
the USB Function Interrupt routine (if the device is bus powered):
Change the DC-DC converter from low current mode to high current mode by setting USBC3 (bit
3 of the USBC) to a “0”.
Re-enable the PLL for 48MHz f(VCO) by setting FSE (bit 0 of the FSC) to a “1”, then wait for
2ms.
Check the lock status bit (LS, bit 7 of FSC).
If the bit is a “1”, go on.
If the bit is a “0”, wait 0.1ms longer and then re-check the bit.
Enable the USB clock by setting USBC5 (bit 5 of USBC) to a "1".
Enable other blocks as necessary.
Note that the configuration changes described above may not need to be made if the MCU was not
placed in a suspend state as described in section 4.6.2.3 "Set up after USB Suspend Detected".
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