R8A66597BG RENESAS [Renesas Technology Corp], R8A66597BG Datasheet - Page 85
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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
2.16.2 Transfer type bit (TYPE)
2.16.3 BRDY interrupt operation specification bit (BFRE)
R e v 1 . 0 1
This bit is valid when the selected pipes are Pipe1 to Pipe5.
When the software has written "1" to this bit and the selected pipe is used in reception, (i.e. when "DIR bit=0" is written),
the controller detects transfer completion and issues a BRDY interrupt when that packet is completely read. When the
BRDY interrupt is issued with these settings, the software need not write "BCLR=1". The status of the FIFO buffer
assigned to the selected pipe does not change to receive status until "BCLR=1".
The software writes "1" to this bit and the selected pipe is used in transmission, (in other words when "DIR bit=1" is
written) the controller does not issue the BRDY interrupt. Refer to the PIPEBRDY interrupt register for details.
This bit can be modified when "CSSTS=0", "PID=NAK", and when the pipe is in the CURPIPE bit is not written.
Execute USB communication by using the selected pipe, use the software to continuously write "ACLRM=1" and
"ACLRM=0", clear the FIFO buffer assigned to the selected pipe, and then modify this bit in addition to the status of the
above three registers.
To modify this bit after chenging the PID bit of the selected pipe from "BUF" to "NAK", check that "CSSTS=0" and
"PBUSY=0", and modify the bit. However, when the controller has modified the PID bit to "NAK", it is not necessary to
check the PBUSY bit.
For this bit, write to USB transfer type of pipe (selected pipe) written to the PIPESEL bit. A list of transfer types that can
be written to the selected pipe and this bit are shown in Table 2.15.
Write a value other than "00" to this bit and then write "PID=BUF" (USB communication is started by writing "PID=BUF"
when using the selected pipe).
This bit can be modified when the PID bit of the selected pipe is in "NAK" status. To modify this bit after chenging the
PID bit of the selected pipe from "BUF" to "NAK", check that "CSSTS=0" and "PBUSY=0", and then modify the bit.
However, when the controller modifies the PID bit to "NAK", it is not necessary to check the PBUSY bit.
Table 2.15 List of Transfer Types That Can Be Written To The Selected Pipe & TYPE bit
O c t 1 7 , 2 0 0 8
Pipe1 or Pipe2
Pipe3 ~ Pipe5
Pipe6 ~ Pipe9
Selected Pipe
p a g e 8 5 o f 1 8 3
"01" or "11"
TYPE Bit
"01"
"10"
Bulk or isochronous transfer
USB Transfer Type
Interrupt transfer
Bulk transfer
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