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R01UH0823EJ0100 Rev.1.00 Page 935 of 1823

Jul 31, 2019

RX23W Group 32. USB 2.0 Host/Function Module (USBc)

32.3.4.1 Pipe Control Register Switching Procedures

The following bits in the pipe control registers can be modified only when USB communication is prohibited (PID[1:0] =

00b (NAK)).

The following shows the registers and bits that should not be modified when USB communication is enabled (PID[1:0] =

01b (BUF)).

 Bits in the DCPCFG and DCPMAXP registers

 The SQCLR and SQSET bits in the DCPCTR register

 Bits in registers PIPECFG, PIPEMAXP, and PIPEPERI

 The ATREPM, ACLRM, SQCLR, and SQSET bits in the PIPEnCTR register

 Bits in the PIPEnTRE and PIPEnTRN registers

In order to modify the above bits in the USB communication enabled (PID[1:0] = 01b (BUF)) state, follow the procedure

shown below:

1. A request to modify bits in the pipe control register occurs.

2. Modify the PID[1:0] bits corresponding to the pipe to 00b (NAK).

3. Wait until the corresponding PBUSY flag is set to 0.

4. Modify the bits in the pipe control register.

The following bits in the pipe control registers can be modified only when the pertinent pipe information has not been set

by the CURPIPE[3:0] bits in registers CFIFOSEL, D0FIFOSEL, and D1FIFOSEL.

Registers that should not be set when the CURPIPE[3:0] bits are set:

 Bits in the DCPCFG and DCPMAXP register

 Bits in registers PIPECFG, PIPEMAXP and PIPEPERI

In order to modify pipe information, the CURPIPE[3:0] bits in the port select registers should be set to a pipe other than

the pipe to be modified. For the DCP, the buffer should be cleared using the BCLR bit in the port control register after the

pipe information is modified.

32.3.4.2 Transfer Types

The PIPECFG.TYPE[1:0] bits are used to specify the transfer type for each pipe. The transfer types that can be set for the

pipes are as follows.

 DCP: No setting is necessary (fixed at control transfer).

 PIPE1 and PIPE2: These should be set to bulk transfer or isochronous transfer.

 PIPE3 to PIPE5: These should be set to bulk transfer.

 PIPE6 to PIPE9: These should be set to interrupt transfer.

32.3.4.3 Endpoint Number

The PIPECFG.EPNUM[3:0] bits are used to set the endpoint number for each pipe. The DCP is fixed at endpoint 0. The

other pipes can be set from endpoint 1 to endpoint 15.

 DCP: No setting is necessary (fixed at endpoint 0).

 PIPE1 to PIPE9: The endpoint numbers from 1 to 15 should be selected and set.

These should be set so that the combination of the PIPECFG.DIR bit and EPNUM[3:0] bits is unique.

Renesas RX Series User Manual

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