HD64F3437TF16 Datasheet, PDF (712/752 Pages) Hitachi Semiconductor – 12 V must not be applied to the S-mask model (single-power-supply specification), as this may permanently damage the device.

STR2—Status Register 2
H'FE
HIF
Bit
7
6
5
4
3
2
1
0
DBU DBU DBU DBU
C/D
DBU
IBF
OBF
Initial value
0
0
0
0
0
0
0
0
Host Read/Write R
R
R
R
R
R
R
R
Slave Read/Write R/W
R/W
R/W
R/W
R
R/W
R
R
Output Buffer Full
0 Host has read ODR2
1 Slave has written to ODR2
Input Buffer Full
0 Slave has read IDR2
1 Host has written to IDR2
Defined By User
Command/Data
0 IDR2 contains data
1 IDR2 contains a command
Defined By User
683