Section 22 USB Function Module (USB)
Rev. 1.00 Mar. 12, 2008 Page 878 of 1178
REJ09B0403-0100
22.5.5
EP1 Bulk-Out Transfer (Dual FIFOs)
Either of EP1
FIFOs empty?
Yes
No
FIFO FULL processing
Read EP1 receive
data size register (EPSZ1)
Read EP1 data
register (EPDR1)
USB function
NAK
ACK
OUT token reception
Data reception from host
Set EP1 FIFO full status
(IFR0.EP1 FULL = 1)
Interrupt request
Application
Set EP1 read complete bit
(TRG.EP1 RDFN = 1)
Clear EP1 FIFO full status
(IFR0.EP1 FULL = 0)
Resume
Figure 22.15 EP1 Bulk-Out Transfer Operation
EP1 has two 64-byte FIFOs, but the user can receive data and read receive data without being
aware of this dual-FIFO configuration.
When one FIFO is full after reception is completed, the EP1FULL bit in IFR0 is set. After the first
receive operation into one of the FIFOs when both FIFOs are empty, the other FIFO is empty, and
so the next packet can be received immediately. When both FIFOs are full, NAK is returned to the
host automatically. When reading of the receive data is completed following data reception, 1 is
written to the EP1RDFN bit in TRG and 0 is written to the EP1FULL bit in IFR0. This operation
empties the FIFO that has just been read, and makes it ready to receive the next packet.
Summary of Contents for H8S Family
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Page 70: ...Section 1 Overview Rev 1 00 Mar 12 2008 Page 22 of 1178 REJ09B0403 0100...
Page 108: ...Section 2 CPU Rev 1 00 Mar 12 2008 Page 60 of 1178 REJ09B0403 0100...
Page 116: ...Section 3 MCU Operating Modes Rev 1 00 Mar 12 2008 Page 68 of 1178 REJ09B0403 0100...
Page 152: ...Section 5 Interrupt Controller Rev 1 00 Mar 12 2008 Page 104 of 1178 REJ09B0403 0100...
Page 206: ...Section 6 Bus Controller BSC Rev 1 00 Mar 12 2008 Page 158 of 1178 REJ09B0403 0100...
Page 420: ...Section 9 14 Bit PWM Timer PWMX Rev 1 00 Mar 12 2008 Page 372 of 1178 REJ09B0403 0100...
Page 476: ...Section 12 Watchdog Timer WDT Rev 1 00 Mar 12 2008 Page 428 of 1178 REJ09B0403 0100...
Page 552: ...Section 14 CRC Operation Circuit CRC Rev 1 00 Mar 12 2008 Page 504 of 1178 REJ09B0403 0100...
Page 712: ...Section 18 I2 C Bus Interface IIC Rev 1 00 Mar 12 2008 Page 664 of 1178 REJ09B0403 0100...
Page 804: ...Section 19 LPC Interface LPC Rev 1 00 Mar 12 2008 Page 756 of 1178 REJ09B0403 0100...
Page 838: ...Section 20 Ethernet Controller EtherC Rev 1 00 Mar 12 2008 Page 790 of 1178 REJ09B0403 0100...
Page 964: ...Section 24 RAM Rev 1 00 Mar 12 2008 Page 916 of 1178 REJ09B0403 0100...
Page 1066: ...Section 25 Flash Memory Rev 1 00 Mar 12 2008 Page 1018 of 1178 REJ09B0403 0100...
Page 1098: ...Section 26 Boundary Scan JTAG Rev 1 00 Mar 12 2008 Page 1050 of 1178 REJ09B0403 0100...
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