Section 8 RAM-FIFO Unit (RFU)
Rev. 3.00 Jan 25, 2006 page 196 of 872
REJ09B0286-0300
Receive OUT token from the host
Start USBID interrupt handling
Read from USBIFR0 and
USBIFR1 to judge
an interrupt source
End USBID interrupt processing
Clear interrupt flag
Read UDTRFR to confirm
the EP5UDTR interrupt
Read data from
RFU/FIFO
(MMC, etc.)
Read TSFR0 to confirm
the EP5TS interrupt
Is EP5 stalled?
Is EP5 receive buffer
empty?
Is it necessary to
read data from
RFU/FIFO?
End data reception from the host
Transmit ACK packet
No
No
No
No
No
No
No
No
Yes
Yes
Yes
No
Yes
Yes
Yes
Yes
Yes
Yes
Set the EP5TS interrupt flag
End data transmission correctly
Write data to RFU/FIFO
Set the EP5UTDR interrupt flag
Request USBID interrupt
IDLE
Manipulate pointer
update to the RFU
Transmit STALL
packet
Transmit NAK
packet
End data transmission abnormally
Set the EP5TF interrupt flag
Manipulate pointer
rewind to the RFU
No handshake
(timeout)
The host transmits
data but it is not
received by
the device side
The host transmits
data but it is not
received by
the device side
Is receive buffer busy ?
Does the EP5
receive buffer
overrun?
Does received data
include any errors?
Is EP5 receive
buffer empty?
Abnormally end
during data phase?
Does RFU/FIFO
overrun?
Start data reception from
the host
IDLE
To (B)
From the device
From the device
From the device
Token phase
Data phase
Handshake
phase
Hardware (USB, RFU)
Firmware (CPU)
TS
UDTR
Read TFFR0 to confirm
the EP5TF interrupt
TF
(B)
When the interrupt is EP5UDTR request
For instance, the RFU update processing of
previous data communication is not completed
Figure 8.6 Operation Flow of USB OUT Transfer
Summary of Contents for H8S/2158
Page 10: ...Rev 3 00 Jan 25 2006 page viii of lii...
Page 36: ...Rev 3 00 Jan 25 2006 page xxxiv of lii B Product Lineup 863 C Package Dimensions 864 Index 865...
Page 47: ...Rev 3 00 Jan 25 2006 page xlv of lii Appendix Figure C 1 Package Dimensions TBP 112A 864...
Page 54: ...Rev 3 00 Jan 25 2006 page lii of lii...
Page 70: ...Section 1 Overview Rev 3 00 Jan 25 2006 page 16 of 872 REJ09B0286 0300...
Page 118: ...Section 3 MCU Operating Modes Rev 3 00 Jan 25 2006 page 64 of 872 REJ09B0286 0300...
Page 126: ...Section 4 Exception Handling Rev 3 00 Jan 25 2006 page 72 of 872 REJ09B0286 0300...
Page 198: ...Section 6 Bus Controller Rev 3 00 Jan 25 2006 page 144 of 872 REJ09B0286 0300...
Page 326: ...Section 10 8 Bit PWM Timer PWM Rev 3 00 Jan 25 2006 page 272 of 872 REJ09B0286 0300...
Page 440: ...Section 15 Watchdog Timer WDT Rev 3 00 Jan 25 2006 page 386 of 872 REJ09B0286 0300...
Page 606: ...Section 17 I 2 C Bus Interface IIC Rev 3 00 Jan 25 2006 page 552 of 872 REJ09B0286 0300...
Page 742: ...Section 19 Multimedia Card Interface MCIF Rev 3 00 Jan 25 2006 page 688 of 872 REJ09B0286 0300...
Page 750: ...Section 21 D A Converter Rev 3 00 Jan 25 2006 page 696 of 872 REJ09B0286 0300...
Page 768: ...Section 22 A D Converter Rev 3 00 Jan 25 2006 page 714 of 872 REJ09B0286 0300...
Page 770: ...Section 23 RAM Rev 3 00 Jan 25 2006 page 716 of 872 REJ09B0286 0300...
Page 824: ...Section 26 Clock Pulse Generator Rev 3 00 Jan 25 2006 page 770 of 872 REJ09B0286 0300...
Page 844: ...Section 27 Power Down Modes Rev 3 00 Jan 25 2006 page 790 of 872 REJ09B0286 0300...
Page 878: ...Section 28 List of Registers Rev 3 00 Jan 25 2006 page 824 of 872 REJ09B0286 0300...
Page 926: ...Index Rev 3 00 Jan 25 2006 page 872 of 872 REJ09B0286 0300...