m5m51016btp Renesas Electronics Corporation., m5m51016btp Datasheet - Page 183

• Manufacturer Part Number: m5m51016btp
• Description: Renesas 16-bit Single-chip Microcomputer M16c Family / M16c/20 Series
• Manufacturer: Renesas Electronics Corporation.

M30245 Group
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
Figure 2.8.33. USB endpoint 0 MAXP register
Figure 2.8.34. USB endpoint 0 OUT write count register
USB Endpoint 0 MAXP register
(b15)
0 0 0 0 0 0 0 0 0
b7
USB Endpoint 0 Write Count register
(b15)
0 0 0 0 0 0 0 0
b7
This register indicates the IN/OUT maximum packet size of endpoint 0.
When a GET_DESCRIPTION request is received from the host CPU, write to this register to change
the IN/OUT maximum packet size value of endpoint 0.
Set the packet size value (8, 16 or 32 bytes) specified by control transfer. The default value is 8 bytes.
The configuration of USB endpoint 0 MAXP register is shown in Figure 2.8.33.
This register contains the number of bytes of the current data set in the OUT FIFO. When the USB
function control unit completes the data packet receive from the host CPU, set the value of this regis-
ter. When one buffer data receive completes, read this register and determine the number of bytes to
be read from OUT FIFO. This register value is not decremented even if the data is read from OUT
FIFO.
When CLR_OUT_BUF_RDY bit of the EP0CSR is set to “1”, this register value is cleared to “0”.
The configuration of USB endpoint 0 OUT write count register is shown in Figure 2.8.34.
USB endpoint 0 MAXP register
USB endpoint 0 OUT write count register
(b8)
b0
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(b8)
b0
b7
b7
b0
b0
EP0MP6-0
Reserved
Bit Symbol
Reserved
Symbol
EP0MP
EP0WC7-0
Bit Symbol
Symbol
EP0WC
Maximum packet size
Receive byte count
Bit Name
Bit Name
Address
029A
Address
029C
16
16
The number of bytes of the current
data set in EP0 OUT FIFO
Must always be “0”
Set maximum packet size
of EP0 IN/OUT
Must always be “0”
Function
When reset
Function
0008
When reset
16
0000
2. USB function
16
R W
O O
O X
O O
R W
O O