NXP Semiconductors LPC1768 - State: 0 X48; State: 0 X50; State: 0 X58; Slave Receiver States

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User manual Rev. 3 — 19 December 2013 470 of 841
NXP Semiconductors
UM10360
Chapter 19: LPC176x/5x I2C0/1/2
3. Exit
19.10.7.2 State: 0x48
Slave Address + Read has been transmitted, NOT ACK has been received. A STOP
condition will be transmitted.
1. Write 0x14 to I2CONSET to set the STO and AA bits.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Exit
19.10.7.3 State: 0x50
Data has been received, ACK has been returned. Data will be read from I2DAT. Additional
data will be received. If this is the last data byte then NOT ACK will be returned, otherwise
ACK will be returned.
1. Read data byte from I2DAT into Master Receive buffer.
2. Decrement the Master data counter, skip to step 5 if not the last data byte.
3. Write 0x0C to I2CONCLR to clear the SI flag and the AA bit.
4. Exit
5. Write 0x04 to I2CONSET to set the AA bit.
6. Write 0x08 to I2CONCLR to clear the SI flag.
7. Increment Master Receive buffer pointer
8. Exit
19.10.7.4 State: 0x58
Data has been received, NOT ACK has been returned. Data will be read from I2DAT. A
STOP condition will be transmitted.
1. Read data byte from I2DAT into Master Receive buffer.
2. Write 0x14 to I2CONSET to set the STO and AA bits.
3. Write 0x08 to I2CONCLR to clear the SI flag.
4. Exit
19.10.8 Slave Receiver states
19.10.8.1 State: 0x60
Own Slave Address + Write has been received, ACK has been returned. Data will be
received and ACK returned.
1. Write 0x04 to I2CONSET to set the AA bit.
2. Write 0x08 to I2CONCLR to clear the SI flag.
3. Set up Slave Receive mode data buffer.
4. Initialize Slave data counter.
5. Exit