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• STR4
Bit
Bit Name Initial Value Slave Host Description
7
DBU47
0
6
DBU46
0
5
DBU45
0
4
DBU44
0
3
C/D4
0
2
DBU42
0
1
IBF4
0
0
OBF4
0
Note:
Only 0 can be written to clear the flag.
*
R/W
R/W
R
Defined by User
R/W
R
The user can use these bits as necessary.
R/W
R
R/W
R
R
R
Command/Data Flag
When the host writes to IDR4, bit 2 of the I/O
address is written into this bit to indicate whether
IDR4 contains data or a command.
0: Content of input data register (IDR4) is a data.
1: Content of input data register (IDR4) is a
command.
R/W
R
Defined by User
The user can use this bit as necessary.
R
R
Input Buffer Full
This bit is an internal interrupt source to the slave
(this LSI).
0: [Clearing condition]
When the slave reads IDR4
1: [Setting condition]
When the host writes to IDR4 in I/O write cycle
R/(W)* R
Output Buffer Full
0: [Clearing conditions]
•
When the host reads ODR4 in I/O read cycle
•
When the slave writes 0 to the OBF3 bit
1: [Setting condition]
When the slave writes to ODR4
Section 20 LPC Interface (LPC)
Rev. 1.00 May 09, 2008 Page 611 of 954
REJ09B0462-0100
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