Datasheet

V850ES/JG3-H, V850ES/JH3-H CHAPTER 21 USB FUNCTION CONTROLLER (USBF)
R01UH0042EJ0500 Rev.5.00 Page 1117 of 1513
Aug 12, 2011
(32) UF0 GPR register (UF0GPR)
This register controls USBF and the USB interface.
This register is write-only, in 8-bit units. If this register is read, 00H is read. Be sure to clear bits 7 to 1 to “0”.
FW can reset the USBF by writing 1 to bit 0 of this register. This bit is automatically cleared to 0 after 1 has been
written to it. Writing 0 to this bit is invalid.
0UF0GPR 0
5
00
3
0
2
0
1
0 MRST
Address
0020006EH
After reset
00H
0467
Bit position Bit name Function
0 MRST
Set this bit to 1 to reset USBF.
1: Reset
Actually, USBF is reset two USB clocks after this bit has been set to 1 by FW and the
write signal has become inactive.
Resetting USBF by the MRST bit while the system clock is operating has the same result
as resetting by the RESET pin (hardware reset) (register value back to default value).