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Bit
Bit Name
1
CLR_RD_
PTR
0
CLR_WR_
PTR
Notes: 1. Only 1 can be written to set this flag.
2. Only 0 can be written to clear this flag.
3. Only 1 can be written to toggle this flag.
4. Only 0 can be written to set this flag.
5. Only 1 can be written to clear this flag.
R/W
Initial
Value
Slave
Host Description
2
0
R/(W)*
(W)*
2
0
R/(W)*
(W)*
1
Read Pointer Clear
This bit is used by the host to clear the read pointer
during read transfer. A host read operation always
yields 0 on readout.
0: Read pointer clear wait
[Clearing condition]
When the slave writes a 0 after a 1 has been read
from CLR_RD_PTR.
1: Read pointer clear
[Setting condition]
When the host writes a 1.
1
Write Pointer Clear
This bit is used by the host to clear the write pointer
during write transfer. A host read operation always
yields 0 on readout.
0: Write pointer clear wait
[Clearing condition]
When the slave writes a 0 after a 1 has been read
from CLR_WR_PTR.
1: Write pointer clear
[Setting condition]
When the host writes a 1.
Rev. 1.00 Mar. 12, 2008 Page 729 of 1178
Section 19 LPC Interface (LPC)
REJ09B0403-0100
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