Microcontrollers User manual

User manual Rev. 02 — 19 December 2008 589 of 792

NXP Semiconductors

UM10237

Chapter 22: LPC24XX I

C interfaces I

C0/1/2

If the AA bit is reset during a transfer, the I

C block will return a not acknowledge (logic 1)

to SDA after the next received data byte. While AA is reset, the I

C block does not

respond to its own slave address or a general call address. However, the I

C bus is still

monitored and address recognition may be resumed at any time by setting AA. This

means that the AA bit may be used to temporarily isolate the I

C block from the I

C bus.