R01UH0822EJ0100 Rev.1.00
Page 620 of 1041
Jul 31, 2019
RX13T Group
23. Serial Communications Interface (SCIg, SCIh)
23.2.16
I
2
C Mode Register 2 (SIMR2)
Note 1. Writing to these bits is only possible when the RE and TE bits in the SCR are 0 (serial reception and transmission disabled).
SIMR2 is used to select how reception and transmission are controlled in simple I
2
C mode.
This bit selects the sources of interrupt requests in simple I
2
C mode.
IICCSC Bit (Clock Synchronization)
Set the IICCSC bit to 1 if the internally generated SSCLn clock signal is to be synchronized when the SSCLn pin has
been placed at the low level in the case of a wait inserted by the other device, etc.
The SSCLn clock signal is not synchronized if the IICCSC bit is 0. The SSCLn clock signal is generated in accord with
the rate selected in the BRR regardless of the level being input on the SSCLn pin.
Set the IICCSC bit to 1 except during debugging.
IICACKT Bit (ACK Transmission Data)
Transmitted data contains ACK bits. Set this bit to 1 when ACK and NACK bits are received.
Address(es): SCI1.SIMR2 0008 A02Ah, SCI5.SIMR2 0008 A0AAh, SCI12.SIMR2 0008 B30Ah
b7
b6
b5
b4
b3
b2
b1
b0
—
—
IICACK
T
—
—
—
IICCSC IICINT
M
Value after reset:
0
0
0
0
0
0
0
0
Bit
Symbol
Bit Name
Description
R/W
b0
I
2
C Interrupt Mode Select
0: Use ACK/NACK interrupts.
1: Use reception and transmission interrupts.
b1
Clock Synchronization
0: No synchronization with the clock signal
1: Synchronization with the clock signal
b4 to b2
—
Reserved
These bits are read as 0. The write value should be 0.
R/W
b5
ACK Transmission Data
0: ACK transmission
1: NACK transmission and reception of ACK/NACK
R/W
b7, b6
—
Reserved
These bits are read as 0. The write value should be 0.
R/W