R01UH0822EJ0100 Rev.1.00
Page 623 of 1041
Jul 31, 2019
RX13T Group
23. Serial Communications Interface (SCIg, SCIh)
23.2.18
I
2
C Status Register (SISR)
Note 1. Only 0 can be written to this bit, to clear the flag.
SISR is used to monitor state in relation to simple I
2
C mode.
IICACKR Flag (ACK Reception Data Flag)
Received ACK and NACK bits can be read from this bit.
The IICACKR flag is updated at the rising of SSCLn clock for the ACK/NACK receiving bit.
Address(es): SCI1.SISR 0008 A02Ch, SCI5.SISR 0008 A0ACh, SCI12.SISR 0008 B30Ch
b7
b6
b5
b4
b3
b2
b1
b0
—
—
—
—
—
—
—
IICACK
R
Value after reset:
0
0
x
x
0
x
0
0
x: Undefined
Bit
Symbol
Bit Name
Description
R/W
b0
ACK Reception Data Flag
0: ACK received
1: NACK received
b1
—
Reserved
This bit is read as 0. The write value should be 0.
R/W
b2
—
Reserved
The read value is undefined.
R
b3
—
Reserved
This bit is read as 0. The write value should be 0.
R/W
b5, b4
—
Reserved
The read value is undefined.
R
b7, b6
—
Reserved
These bits are read as 0. The write value should be 0.
R/W