M30240ECFP MITSUBISHI [Mitsubishi Electric Semiconductor], M30240ECFP Datasheet - Page 134

• Manufacturer Part Number: M30240ECFP
• Description: M30240 Group Specification
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Specifications in this manual are tentative and subject to change
Frequency Synthesizer Interface and DC-DC Converter
5.0 Applications
5.1 Frequency Synthesizer Interface and DC-DC Converter
Figure 1.117: SFR Reset Venn Diagram
5.1.1 Reset of USB Related Registers
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 pow-
er to the D+/D- drivers
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 func-
tion registers (SFRs) that are affected by Hardware Reset, USB Reset, or both are shown in Figure
1.117.
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 Section 2.4 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 300
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 empty after USB reset because the FIFO ad-
dress pointers are reset. However, the physical contents of the FIFOs are not set to all ‘1‘s or all ‘0‘s.
Other SFRs such as USBC, FSC, and CM0, CM1 are not affected by a USB Reset.
0004
000C (USBC),
378
3DC
SFR Registers:
16
16
16
to 3FF
(FSC)
to 005F
Hardware Reset
16
16
1-134
,
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
300
(USB FCU registers)
SFR Registers:
USB Reset
16
to 33C
16
Mitsubishi microcomputers
M30240 Group
16
to 33C
16
and