Section 18 Universal Serial Bus Interface (USB)
Rev. 3.00 Jan 25, 2006 page 617 of 872
REJ09B0286-0300
USB Host
USB Function Core
Slave CPU
Core Interface
Notes: 1. When an EP4TF interrupt is specified as a USBIB or USBIC interrupt according to the INTSELR0 setting, the corresponding interrupt
occurs. In this case, if a USBIB or USBIC interrupt occurs, interrupt source determination process is not required. (Note that TFFR0
must be accessed to clear the flags.)
2. When an EP4TS interrupt is specified as a USBIB or USBIC interrupt according to the INTSELR0 setting, the corresponding interrupt
occurs. In this case, if a USBIB or USBIC interrupt occurs, interrupt source determination process is not required. (Note that TSFR0
must be accessed to clear the flags.)
Receive a NAK
handshake packet
Send NAK to the host CPU
Send NAK to the slave CPU
Request an USBID
interrupt (EP4TF)
*
1
Initiate the USBID interrupt
processing
Read USBIFR0 and check
if a TF interrupt occurs
or not
Read TSFR0 and check
if an EP2TF interrupt occurs
or not
Read the RFU pointer, write
data to EP4 RAM-FIFO for
the number of bytes which
can be written to, and modify
the RFU pointer
Complete the USBID
interrupt processing
Send an IN token
packet
Receive an IN data
packet (64 bytes)
Re-transmission
Modify the RFU pointer
Write data to the EP4
transmit buffer (pre-read)
and request the RFU
transmission
Send an IN token packet
Set the EP4TE bit of
PTTER0 to 1
Read data from the EP4
transmit buffer
Request RFU transmission
Send an ACK
handshake packet
Send ACK to the slave CPU
Request an USBID interrupt
(EP4TS)
*
2
Initiate the USBID interrupt
processing
The following procedure is
the same as that when
the initial FIFO is full.
Receive an IN token packet
Clear the EP4TF bit of
TFSR0 to 0
Modify the RFU pointer
and send ACK
Read the RAM-FIFO, send
ACK, and write to the
transmit buffer
Send an IN data
packet (64 bytes)
Receive ACK
Disable data read because
the EP4 transmit buffer is empty
Receive an IN token packet
Figure 18.13 Operation on Receiving an IN Token (EP4-IN: Initial FIFO Is Empty)
Содержание H8S/2158
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Страница 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Страница 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Страница 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Страница 744: ...Section 20 Encryption Operation Circuit DES and GF Rev 3 00 Jan 25 2006 page 690 of 872 REJ09B0286 0300...
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Страница 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Страница 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...