r8a66597 Renesas Electronics Corporation., r8a66597 Datasheet - Page 20

• Manufacturer Part Number: r8a66597
• Description: Assp Usb2.0 2 Port Host/1 Port Peripheral Controller
• Manufacturer: Renesas Electronics Corporation.

R8A66597FP/DFP/BG
2.3.5.2 Peripheral Controller function selection
2.3.6
2.3.7
2.3.7.1 Port0 pull-down resistance control (DRPD) for the Host Controller function
2.3.7.2 Port0 D+ pull-up resistance control (DPRPU) for the Peripheral Controller function
R e v 1 . 0 1
DRPD
Write
Controller function selection bit (DCFM)
Set this bit to specify the Host Controller function or Peripheral Controller function for the controller.
This bit can be modified when "DPRPU=0" and "DRPD=0".
D+, D- line resistance control for Port0 (DRPD and DPRPU)
Settings related to USB data bus resistance of Port0 are given in Table 2.4. Select USB data bus resistance in DRPD
and DPRPU bits.
When "HSE=0" is written, the controller executes Full-Speed operations. When "HSE=1" is written, the controller
executes reset handshake protocol and, depending on the result, Hi-Speed or Full-Speed operations are executed
automatically.
This bit can be modified when "DPRPU=0".
If "1" is written to this bit while selecting the Host Controller function, the controller pulls down the Port0 D+ and D-
lines.
When selecting the Host Controller function, write "1" to this bit.
If "1" is written to this bit while selecting the Peripheral Controller function, the controller pulls up the Port0 D+ line to
3.3V, and can notify the USB host of an "attach". The controller cancels the D+ line pull-up if the bit setting is changed
from "1" to "0", and the status for the USB Host can be shown as detached.
Set this bit to "1" when selecting the Peripheral Controller function.
0
0
1
1
O c t 1 7 , 2 0 0 8
Contents
DPRPU
0
1
0
1
Pull-down Pull-down
Pull-down
p a g e 2 0 o f 1 8 3
D- Line
Open
Open
Table 2.4 Port0 USB Data Bus Resistance Control
D+ Line
Pull-up
Pull-up
Open
Execute these settings when the controller is operated as the
Peripheral Controller.
Execute these settings when the controller is operated as the Host
Controller.
Write disabled
USB data bus resistance control
Remarks