M16C65 Datasheet, PDF (625/829 Pages) Renesas Technology Corp – RENESAS MCU M16C FAMILY / M16C/60

Under development
M16C/65 Group
Preliminary Specification
This is a preliminary specification and is subject to change.
25. Multi-Master I²C-bus Interface
Table 25.10 Functions Enabled by Writing to the S10 Register
Bit Setting of the S10 Register
MST TRX BB PIN AL AAS ADR0 LRB
Function
1
1
1
0
0
0
0
0
Sets the I²C interface to start condition standby state
in master transmit/receive mode
1
1
0
0
0
0
0
0 ^{Sets the I2C interface to stop condition standby state}
in master transmit/receive mode
0/1 0/1 –
0
1
1
1
1 Selects communication mode
–: 0 or 1
Refer to 25.3.2 “Generation of Start Condition” and 25.3.3 “Generation of Stop Condition” for start/stop
condition generation.
LRB (Last Receive Bit) (b0)
The LRB bit function in read access is described as follows. See Table 25.10 “Functions Enabled by
Writing to the S10 Register” for the bit function in write access.
The LRB bit stores the last bit value of the received data. It is used to check whether the ACK is
received.
Condition to become 0:
• An ACK response is sent from a receiver at ACK clock.
• The ACKCLK bit is set to 0 (no ACK clock) and the last bit value is 0.
• The S00 register is written.
Condition to become 1:
• No ACK response is sent from a receiver at ACK clock.
• The ACKCLK bit is set to 0 (no ACK clock) and the last bit value is 1.
ADR0 (General Call Detection Flag) (b1)
The ADR0 bit function in read access is described as follows. See Table 25.10 “Functions Enabled by
Writing to the S10 Register” for the bit function in write access.
Condition to become 0:
• Stop condition is detected.
• Start condition is detected.
• The ES0 bit in the S1D0 register is set to 0 (I²C interface disabled).
• The IHR bit in the S1D0 register is set to 1 (I²C interface reset).
Condition to become 1:
• The ALS bit in the S1D0 register is set to 0 (addressing format) and the received slave address is
0000000b (general call) in slave mode.
REJ09B0484-0030 Rev.0.30 Sep 09, 2008
Page 590 of 791