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): 144/172頁
文件大?。?/td> 1193K
代理商: M37640E8
4-8
8/10/98
Using the Frequency Synthesizer and DC-DC Converter
7600 Series
M37640E8-XXXF Preliminary Specification
Mitsubishi Microcomputers
4.6
Using the Frequency Synthesizer and DC-DC Converter
This section presents the recommended method of setting up and using the frequency synthesizer that
generates the 48MHz clock needed by the USB FCU and the DC-DC converter that provides power to
the D+/D- drivers.
4.6.1
Reset of USB Related Registers
Figure 4-4. SFR Reset Venn Diagram
The special function registers (SFRs) that govern the operation of the frequency synthesizer, DC-DC
converter and USB FCU are affected by one or more reset events. The addresses of the special
function registers (SFRs) that are affected by Hardware Reset, USB Reset, or both are shown in Figure
4-4.
All resettable SFRs, including SFRs and other registers internal to the USB FCU, are affected by a
Hardware Reset, which occurs when the RESET pin is brought low or an undefined opcode is fetched.
See Table 2.1 for a complete listing of SFRs and their reset values.
Only registers internal to the USB FCU are reset when a USB Reset sent by the Host/Hub is detected.
These USB registers are reset to their default values except for bit 5 of USBIS2 (USB Reset Interrupt
Status Flag), which is set to a “1”. USB FCU registers are registers from address 0050
16
to 005E
16
and all other registers within the USB FCU, many of which the MCU does not have direct access to
(e.g. FIFO address pointers). The USB FIFO registers are not reset. Other SFRs such as USBC, FSC,
and CCR are not affected by a USB Reset.
Hardware Reset
USB Reset
SFR Registers:
0000
16
to 0012
16
,
0013
16
(USBC),
0014
16
to 001E
16
,
001F
16
(CCR),
0020
16
to 004F
16
,
006C
16
(FSC),
006D
16
to 006F
16
SFR Registers:
0050
16
to 005E
16
(USB FCU registers)
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