I 2 C-Bus Status Register 2 (Icsr2) - Renesas RX100 Series User Manual

RX13T Group
2
24.2.10 I C-bus Status Register 2 (ICSR2)
Address(es): RIIC0.ICSR2 0008 8309h
b7 b6
TDRE TEND
0 0
Value after reset:
Bit Symbol Bit Name
b0 TMOF Timeout Detection Flag
b1 AL Arbitration-Lost Flag
b2 START Start Condition Detection Flag
b3 STOP Stop Condition Detection Flag
b4 NACKF NACK Detection Flag
b5 RDRF Receive Data Full Flag
b6 TEND Transmit End Flag
b7 TDRE Transmit Data Empty Flag
Note 1. Only 0 can be written to clear the flag.
TMOF Flag (Timeout Detection Flag)
This flag is set to 1 when the RIIC recognizes timeout after the SCL0 line state remains unchanged for a certain period.
[Setting condition]
 When the SCL0 line state remains unchanged for the period specified by bits ICMR2.TMOH, TMOL, and TMOS
while the ICFER.TMOE bit is 1 (the timeout function is enabled) in master mode or in slave mode and the received
slave address matches.
[Clearing conditions]
 When 0 is written to the TMOF bit after reading TMOF = 1
 When 1 is written to the ICCR1.IICRST bit to apply an RIIC reset or an internal reset
AL Flag (Arbitration-Lost Flag)
This flag shows that bus mastership has been lost (loss in arbitration) due to a bus conflict or some other reason when a
start condition is issued or an address and data are transmitted. The RIIC monitors the level on the SDA0 line during
transmission and, if the level on the line does not match the value of the bit being output, sets the value of the AL flag to
1 to indicate that the bus is occupied by another device.
The RIIC can also set the flag to indicate the detection of loss of arbitration during NACK transmission in master mode
or during data transmission in slave mode.
R01UH0822EJ0100 Rev.1.00
Jul 31, 2019
b5 b4 b3 b2
RDRF NACKF STOP START
0 0 0 0
b1 b0
AL TMOF
0 0
Description
0: Timeout is not detected.
1: Timeout is detected.
0: Arbitration is not lost.
1: Arbitration is lost.
0: Start condition is not detected.
1: Start condition is detected.
0: Stop condition is not detected.
1: Stop condition is detected.
0: NACK is not detected.
1: NACK is detected.
0: The ICDRR register contains no receive data.
1: The ICDRR register contains receive data.
0: Data is being transmitted.
1: Data has been transmitted.
0: The ICDRT register contains transmit data.
1: The ICDRT register contains no transmit data.
2
24. I C-bus Interface (RIICa)
R/W
R/(W)
1
*
R/(W)
1
*
R/(W)
1
*
R/(W)
1
*
R/(W)
1
*
R/(W)
1
*
R/(W)
1
*
R
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