R8A66597BG RENESAS [Renesas Technology Corp], R8A66597BG Datasheet - Page 79

• Manufacturer Part Number: R8A66597BG
• Description: ASSP (USB2.0 2 Port Host/1 Port Peripheral Controller)
• Manufacturer: RENESAS [Renesas Technology Corp]

R8A66597FP/DFP/BG
Remarks
None
2.15.7 Buffer status bit (BSTS)
2.15.8 Setup token transmission bit (SUREQ)
R e v 1 . 0 1
1-0
Bit
PID
Response PID
(1) When "ISEL=0": Indicates whether read of reception data is possible.
(2) When "ISEL=1": Indicates whether write of transmission data is possible.
The controller indicates by this bit whether access of the FIFO buffer assigned to the DCP is possible from the CPU.
The meaning of this bit differs according to the setup value of the ISEL bit as follows:
When the Host Controller function is selected, the controller transmits a Setup packet by using the software to write "1"
to this bit.
After the Setup transaction process is completed, the controller issues a SACK interrupt or a SIGN interrupt and writes
"0" to this bit. The controller writes "0" to this bit using the software to write "1" to the SUREQCLR bit.
Set the USB request to be transmitted to the DEVSEL bit, USBREQ register, USBVAL register, USBINDX register and
USBLENG register, and then write "1" to this bit. Check whether the PID bit of the DCP is set to "NAK", and then write
"SUREQ=1". Thereafter, do not modify the values of the DEVSEL bit, USBREQ register, USBVAL register, USBINDX
register and USBLENG register until the Setup transaction is completed ("SUREQ=1").
Write "1" to this bit only while transmitting the Setup token. In other cases, always write it to "0".
When the Peripheral Controller function is selected, write "0" to this bit.
O c t 1 7 , 2 0 0 8
Name
p a g e 7 9 o f 1 8 3
This bit controls the controller response in the control
transfer.
00: NAK response
01: BUF response (conforms with the buffer state)
10: STALL response
11: STALL response
Function
Software Hardware Remarks
R/W
R/W