M30245_06 RENESAS [Renesas Technology Corp], M30245_06 Datasheet - Page 215

• Manufacturer Part Number: M30245_06
• Description: RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/20 SERIES
• Manufacturer: RENESAS [Renesas Technology Corp]

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Figure 2.8.49. Endpoint 1 to 4 IN packet prepare routine
(6) USB Transmit (Endpoints 1 to 4 IN): Example
The endpoints 1 to 4 IN transmit packet prepare routine (continuous transfer disable) is shown in
Figure 2.8.49. In addition to packet prepare process, error process by the UNDER_RUN flag is re-
quired in isochronous transfer.
(b15)
Note 2: The packet data is one buffer data in continuous transfer mode.
Note 3: When the AUTO_SET bit is set to “1”, this bit is automatically set to “1” when the data count set by
3. Setting of the SET_IN_BUF_RDY bit to “1” and completion of one packet data (Note 2) prepare.
b7
(b15)
0
(b15)
b7
0
b7
Note 1: The packet data is one buffer data in continuous transfer mode.
2. Writing of the transmit data equal to one packet data (Note 1) to the IN FIFO.
1. Confirming of whether there is a space which is equal to one packet in the IN FIFO:
0
0
check the IN_BUF_STS0 and the IN_BUF_STS1.
AUTO_SET bit is set to “1” and it is a short packet (data packet which is smaller than maximum packet size),
this bit is set to “1” by software.
0
maximum packet size register is written to the IN FIFO. When the AUTO_SET bit is set to “0” or the
0
0
0
IN FIFO full
0
0
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(b8)
b0
(b8)
b0
(b8)
b0
Execution of the above 2 and 3 again when the second
packet data is set on the double buffer mode.
b7
b7
b7
Process of USB endpoint x IN packet prepare
Completion of packet data prepare
0
Setting of the transmit data
b0
b0
b0
USB endpoint x IN control and status register
EPxICS (x = 1 - 4) [Address 029E
USB endpoint x IN FIFO data register
EPxI (x = 0 - 4) [Address 02E0
SET_IN_BUF_RDY bit
USB endpoint x IN control and status register
EPxICS (x = 1 - 4) [Address 029E
IN_BUF_STS0 flag
IN_BUF_STS1 flag
b1 b0
1 : Transmission data set loaded to the IN buffer
0 0 : No data set in the IN buffer
0 1 : Single buffer mode: N/A
1 0 : N/A
1 1 : Single buffer mode: one data set in the IN buffer
(updates IN_BUF_STS0, IN_BUF_STS1 flags)
There is a space in the IN FIFO.
Double buffer mode: one data set in the IN buffer
Double buffer mode: two data set in the IN buffer
16
, 02E4
16
16
, 02A4
, 02A4
16
, 02E8
16
16
16
, 02AA
, 02AA
, 02EC
16
16
16
, 02B0
, 02B0
, 02F0
2. USB function
16
16
16
]
]
]