Datasheet

Section 19 LPC Interface (LPC)
Rev. 3.00 Sep. 28, 2009 Page 619 of 910
REJ09B0350-0300
• STR4
R/W
Bit Bit Name Initial Value Slave Host Description
7
6
5
4
DBU47
DBU46
DBU45
DBU44
0
0
0
0
R/W
R/W
R/W
R/W
R
R
R
R
Defined by User
The user can use these bits as necessary.
3 C/D4 0 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
2 DBU42 0 R/W R Defined by User
The user can use this bit as necessary.
1 IBF4 0 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
0 OBF4 0 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 OBF4 bit
1: [Setting condition]
When the slave writes to ODR4
Note: * Only 0 can be written to clear the flag.