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Section 26 USB 2.0 Host/Function Module
Page 1546 of 2108 R01UH0134EJ0400 Rev. 4.00
Sep 24, 2014
SH7262 Group, SH7264 Group
26.5 Usage Notes
26.5.1 Procedure for Setting the USB Transceiver
When this module is to be used, start by making settings for the internal USB transceiver.
The method for the settings is described below. Figure 26.23 also gives an example of program
code to implement the procedure.
(1) Write 1 to the UACS25 bit in the USB AC characteristics switching register 1
(USBACSWR1).
Initialization routine
(1) Set 1 to UACS25.
MOVI20 #H'FFFFC0C2, R0
MOV.W #H'0200, R1
MOV.W R1, @R0
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•
•
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Figure 26.23 Procedure for Setting the USB Transceiver
26.5.2 Power Supply for USB Transceiver
Set the voltage level of power supply USBAV
CC
, USBDV
CC
, and USBUV
CC
to the same as V
CC
.
Set the voltage level of power supply USBAPV
CC
and USBDPV
CC
to the same as PV
CC
.
Set the voltage level of ground USBAV
SS
, USBDV
SS
, USBUV
SS
, USBAPV
SS
, and USBDPV
SS
to
the same as V
SS
.
Separate analog power supplies USBAV
CC
, USBAV
SS
, USBAPV
CC
, and USBAPV
SS
from the
digital power supplies.