M16C26A Datasheet, PDF (180/352 Pages) Renesas Technology Corp – 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/Tiny SERIES

M16C/26A Group (M16C/26A, M16C/26B, M16C/26T)
13. Serial I/O
(1) When the IICM2 bit is set to "0" (ACK or NACK interrupt) and the CKPH bit is set to "0" (No clock delay)
1st 2nd
3rd
4th
5th
6th
7th
8th
9th
bit
bit
bit
bit
bit
bit
bit
bit
bit
SCL2
SDA2
D7 D6 D5 D4 D3 D2 D1 D0 D8 (ACK or NACK)
ACK interrupt (DMA
request) or NACK interrupt
b15
b9 b8 b7
b0
Data is transferred to the U2RB register ^{•••} D8 D7 D6 D5 D4 D3 D2 D1 D0
Contents of the U2RB register
(2) When the IICM2 bit is set to "0" and the CKPH bit is set to "1" (clock delay)
1st 2nd
3rd
4th
5th
6th
7th
8th
9th
bit
bit
bit
bit
bit
bit
bit
bit
bit
SCL2
SDA2
D7 D6 D5 D4 D3 D2 D1 D0 D8 (ACK or NACK)
ACK interrupt (DMA
request) or NACK interrupt
Data is transferred to the U2RB register
b15
b9 b8 b7
b0
••• _{D8 D7 D6 D5 D4 D3 D2 D1 D0}
Contents of the U2RB register
(3) When the IICM2 bit is set to "1" (UART transmit or receive interrupt) and the CKPH bit is set to "0"
1st 2nd
3rd 4th 5th
6th
7th 8th
9th
bit
bit
bit
bit
bit
bit
bit
bit
bit
SCL2
SDA2
D7 D6 D5 D4 D3 D2 D1 D0 D8 (ACK or NACK)
Receive interrupt Transmit interrupt
(DMA request)
b15
b9 b8 b7
b0
Data is transferred to the U2RB register _{••• D0 D7 D6 D5 D4 D3 D2 D1}
Contents of the U2RB register
(4) When the IICM2 bit is set to "1" and the CKPH bit is set to "1"
1st 2nd
3rd 4th 5th
6th
7th 8th
9th
bit
bit
bit
bit
bit
bit
bit
bit
bit
SCL2
SDA2
D7 D6 D5 D4 D3 D2 D1 D0 D8 (ACK or NACK)
Receive interrupt
(DMA request)
Transmit interrupt
Data is transferred to the U2RB register Data is transferred to the U2RB register
b15
b9 b8 b7
b0
••• D0 D7 D6 D5 D4 D3 D2 D1
Contents of the U2RB register
b15
b9 b8 b7
b0
••• D8 D7 D6 D5 D4 D3 D2 D1 D0
Contents of the U2RB register
The above timing applies to the following setting :
• The CKDIR bit in the U2MR register is set to "1" (slave)
Figure 13.1.3.2. Transfer to U2RB Register and Interrupt Timing
Rev. 2.00 Feb.15, 2007 page 163 of 329
REJ09B0202-0200