SH7280 Datasheet, PDF (1534/1726 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine family

Section 28 Power-Down Modes
Initial
Bit
Bit Name Value R/W Description
7
USBSEL*¹ 1
R/W USB Clock Select
Selects the on-chip CPG or the USB oscillator as the
source of the USB clock.
0: On-chip CPG
1: USB oscillator
Note: Write 1 to this bit in the SH7243.
6
MSTP66*² 1
R/W Module Stop 66
When the MSTP66 bit is set to 1, the supply of the
clock to the USB is halted.
0: USB runs.
1: Clock supply to USB halted.
Note: Write 1 to this bit in the SH7243.
5
USBCLK 0
R/W USB Oscillator Stop
When the USBCLK bit is set to 1, the oscillator
dedicated for the USB stops.
0: USB oscillator operates.
1: USB oscillator stops.
Note: Write 1 to this bit in the SH7243.
4
MSTP64 1
R/W Module Stop 64
When the MSTP64 bit is set to 1, the supply of the
clock to the RCAN is halted.
0: RCAN runs.
1: Clock supply to RCAN halted.
Note: Write 1 to this bit in the SH7285 and SH7243.
3 to 0 
All 1
R
Reserved
These bits are always read as 1. The write value
should always be 1.
Notes: When using the USB, Follow the notes shown below. Otherwise the clock will not be
generated correctly so that USB can be operated improperly.
1. When selecting the on-chip CPG, set the frequency of the input clock to 12MHz.
2. When using the USB, set the frequency of the peripheral clock (Pφ) to 13 MHz or more.
Rev. 1.00 Jun. 26, 2008 Page 1504 of 1692
REJ09B0393-0100