Section 18 Universal Serial Bus Interface (USB)
Rev. 3.00 Jan 25, 2006 page 612 of 872
REJ09B0286-0300
USB Host
USB Function Core
Slave CPU
Core Interface
Notes: 1. When an EP5TS 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.)
2. If the RAM-FIFO size is increased (defined as larger size), the pointer need not be modified after each data processing.
Receive an OUT
token packet
Receive an ACK
handshake packet
Send ACK to the host
Send ACK to
the slave CPU
Request an USBID
interrupt (EP5TS)
*
1
Initiate the USBID interrupt
processing
Read USBIFR0 and check
if a TS interrupt occurs
or not
Read TSFR0 and check
if an EP5TS interrupt occurs
or not
Read the RFU pointer and
check if the EP5 RAM-FIFO
contains 64-byte data
Process RAM-FIFO data
Modify the RFU pointer
*
2
Clear the EP5TS bit of
TSFR0 to 0
Complete the USBID
interrupt processing
Send an OUT
token packet
Send an OUT data
packet (64 bytes)
Read the receive buffer,
write data to RAM-FIFO,
and send ACK
Modify the RFU pointer
and send ACK
Receive an OUT data
packet (64 bytes)
Write data to the EP5
receive buffer
Request RFU
transmission
Request to modify
the RFU pointer
Figure 18.8 Operation on Receiving an OUT Token (EP5-OUT: 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 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Страница 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 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...