Datasheet

Section 16 USB Function Module (USB)
R01UH0309EJ0500 Rev. 5.00 Page 967 of 1408
Sep 24, 2012
H8S/2456, H8S/2456R, H8S/2454 Group
16.3.20 Trigger Register 0 (TRG0)
TRG0 generates one-shot triggers to control the transfer sequence for endpoint 0.
Bit Bit Name
Initial
Value R/W Description
7
6
5
4
3
⎯
⎯
⎯
⎯
⎯
0
0
0
0
0
⎯
⎯
⎯
⎯
⎯
Reserved
These bits are always read as 0. The write value
should always be 0.
2 EP0s RDFN 0 W EP0s Read Complete
Write 1 to this bit after data for the EP0s command
FIFO has been read. Writing 1 to this bit enables
transfer of data in the following data stage. A NAK
handshake is returned in response to transfer
requests from the host in the data stage until 1 is
written to this bit.
1 EP0o RDFN 0 W EP0o Read Complete
Writing 1 to this bit after one packet of data has been
read from the endpoint 0 transmit FIFO buffer
initializes the FIFO buffer, enabling the next packet to
be received.
0 EP0i PKTE 0 W EP0i Packet Enable
After one packet of data has been written to the
endpoint 0 transmit FIFO buffer, the transmit data is
fixed by writing 1 to this bit.