R8A66597BG RENESAS [Renesas Technology Corp], R8A66597BG Datasheet - Page 111
R8A66597BG
Manufacturer Part Number
R8A66597BG
Description
ASSP (USB2.0 2 Port Host/1 Port Peripheral Controller)
Manufacturer
RENESAS [Renesas Technology Corp]
Datasheet
1.R8A66597BG.pdf
(185 pages)
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R8A66597FP/DFP/BG
3.1.8
R e v 1 . 0 1
USB Data Bus Pull-Down and Pull-Up Settings
After selecting the controller function, set the resistance for the USB data line.
This controller has built-in pull-up resistance for the D+ line and pull-down resistance for both the D+ and D- lines.
Power supply for the D+ pull-up is AVCC.
When the Host Controller function is selected, set SYSCFG register DRPD bit to “1” if using PORT0 and set SYSCFG1
register DRPD bit to “1” if using PORT1, and pull-down the D+ and D- lines for each port.
When the Peripheral Controller function is selected, after the connection to the USB Host is confirmed, set SYSCFG
register DPRPU bit to “1” and pull-up D+.
In addition, the controller has built-in D+/D- line terminating resistance for Hi-Speed transmissions and output
resistance for Full-Speed transmissions. The controller automatically switches the built-in resistance after connection
to the USB Host or Peripheral device upon the execution or detection of a reset handshake, suspend, or resume event.
When the Peripheral Controller function is selected and the SYSCFG register DPRPU bit is set to “0” in the USB Host
attached status, the controller disables the USB D+ line pull-up (or D+, D- line termination). Therefore, software can be
used to create the USB cable detached status when viewed from the USB Host.
O c t 1 7 , 2 0 0 8
p a g e 1 1 1 o f 1 8 3
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