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
文件頁數(shù)： 145/172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
4-9
4.6.2
Set up of Frequency Synthesizer and DC-DC Converter
Figure 4-5. PLL, DC-DC Converter and USB Functional Block Diagram
A functional block diagram of the USB system on the M37640E8 which shows how the control signals
affect operation is given in Figure 4-5.
4.6.2.1
Set up after Hardware Reset
A Hardware Reset occurs when either the RESET pin is brought low for more than 2
μ
s or an invalid
opcode is fetched by the CPU. The frequency synthesizer (PLL) and DC-DC converter should be set
up as follows in the Hardware Reset routine (see Figure 4-6):
Power up the M37640E8 and other components on the peripheral device for less than 100mA
operation. The current limit only applies for bus powered devices.
Configure the PLL for 48MHz f(VCO) operation.
Enable the PLL by setting FSE (bit 0 of the Frequency Synthesizer Control Register (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 DC-DC converter in high current mode by setting USBC4 (bit 4 of the USB Control
Register (USBC)) to a “1” and keeping USBC3 (bit 3 of USBC) a “0”. High current mode
should always be used during normal USB operation. Low current mode should only be used dur-
ing a USB suspend.
Wait (C + 1)ms (where C equals the external capacitance connected to the Ext Cap pin in
μ
F)
for the voltage on Ext Cap to reach a steady state voltage of approximately 3.3V. (Since the D+
pullup is connected to the Ext Cap pin, the upstream hub will detect that the peripheral device
has been plugged in once the voltage on D+ reaches approximately 2.0V.)
33
33
D+
D-
USB FCU
2.2
μ
F
0.1
μ
F
Ext Cap
M37640E8
33 pF
Frequency
Synthesizer
enable
Xin
FSE
LS
1
USB Transceiver
DC-DC Converter
USBC3
USBC4
USBC7
USBC7
USBC5
USBCLK
(48MHz)
lock
enable
enable
(enable)
(enable)
enable
current
mode
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