Section 21 Ethernet Controller Direct Memory Access Controller (E-DMAC)
Rev. 1.00 Mar. 12, 2008 Page 798 of 1178
REJ09B0403-0100
21.2.6
EtherC/E-DMAC Status Register (EESR)
EESR is a 32-bit readable/writable register that shows communications status information on the
E-DMAC in combination with the EtherC. The information in this register is reported in the form
of interrupts. Individual bits are cleared by writing 1 (however, bit 22 (ECI) is a read-only bit and
not to be cleared by writing 1) and are not affected by writing 0. Each interrupt source can also be
masked by means of the corresponding bit in the EtherC/E-DMAC status interrupt permission
register (EESIPR).
The interrupts generated by this register are EINT0. For interrupt priority, see section 5.5,
Interrupt Exception Handling Vector Table.
Bit Bit
Name
Initial
value
R/W Description
31
0
R
Reserved
This bit is always read as 0. The initial value should
not be changed.
30 TWB 0 R/W
Write-Back
Complete
Indicates that write-back from the E-DMAC to the
corresponding descriptor has completed. This
operation is enabled when the TIS bit in TRIMD is set
to 1.
0: Write-back has not completed, or no transmission
directive
1: Write-back has completed
29 to 27
All
0
R
Reserved
These bits are always read as 0. The initial value
should not be changed.
26
TABT
0
R/W
Transmit Abort Detection
Indicates that the EtherC aborts transmitting a frame
because of failures during transmitting the frame.
0: Frame transmission has not been aborted or no
transmit directive
1: Frame transmit has been aborted
Содержание H8S Family
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