Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 21 USB FUNCTION CONTROLLER (USBF)
R01UH0042EJ0500 Rev.5.00 Page 1058 of 1513
Aug 12, 2011
21.6 Register Configuration
21.6.1 USB control registers
(1) USB clock select register (UCKSEL)
The UCKSEL register selects the operation clock of the USB controller.
The UCKSEL register can be read or written in 8-bit or 1-bit units.
Reset sets this register to 00H.
0UCKSEL 0 0 0 0
0 UUSEL1
0
After reset: 00H R/W Address: FFFFFF40H
UUSEL1
0
1
External clock input from UCLK pin (f
USB = 48 MHz)
Main clock (f
XX = 48 MHz)
Selection of USB controller operation clock
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Caution Be sure to set bits 7 to 2, and 0 to ‘‘0’’.
(2) USB function control register (UFCKMSK)
The UFCKMSK register controls enable/disable of USB function controller operation.
The UFCKMSK register can be read or written in 8-bit or 1-bit units.
Reset sets this register to 03H.
0UFCKMSK
Other than above
0000
0
UFBUFMSK UFMSK
After reset: 03H R/W Address: FFFFFF41H
UFBUFMSK
0
0
1
UFMSK
0
1
1
Operation enabled
Operation stopped (set while USB is suspended)
Operation stopped
Setting prohibited
USB function controller operation enable/stop
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