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Section 26 USB 2.0 Host/Function Module
R01UH0134EJ0400 Rev. 4.00 Page 1465 of 2108
Sep 24, 2014
SH7262 Group, SH7264 Group
Bit Bit Name
Initial
Value R/W Description
9 TRENB 0 R/W Transaction Counter Enable
Enables or disables the transaction counter.
0: The transaction counter is disabled.
1: The transaction counter is enabled.
For the pipe in the receiving direction, setting this bit
to 1 after setting the total number of the packets to
be received in the TRNCNT bits allows this module
to control hardware as described below on having
received the number of packets equal to the set
value in the TRNCNT bits.
In continuous transmission/reception mode
(CNTMD = 1), this module switches the FIFO
buffer to the CPU side even if the FIFO buffer is
not full on completion of reception.
While SHTNAK is 1, this module modifies the PID
bits to NAK for the corresponding pipe on having
received the number of packets equal to the set
value in the TRNCNT bits.
While BFRE is 1, this module asserts the BRDY
interrupt on having received the number of
packets equal to the set value in the TRNCNT
bits and then reading out the last received data.
For the pipe in the transmitting direction, set this bit
to 0.
When the transaction counter is not used, set this bit
to 0.
When the transaction counter is used, set the
TRNCNT bits before setting this bit to 1. Set this bit
to 1 before receiving the first packet to be counted by
the transaction counter.
8 TRCLR 0 R/W*
1
Transaction Counter Clear
Clears the current value of the transaction counter
corresponding to the pertinent pipe and then sets this
bit to 0.
0: Invalid
1: The current counter value is cleared.