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Inter-Integrated Circuit
Table 9-13. Interrupt summary
9.6.1
Interrupt Source
Complete one-byte transfer
Match of received calling address
Arbitration lost
Wake-up form sop3 interrupt
Byte-transfer interrupt
Status
TCF
IAAS
ARBL
IAAS
Flag
IICIF
IICIF
IICIF
IICIF
Local Enable
IICIE
IICIE
IICIE
IICIE and WUEN
The Transfer Complete Flag (TCF) bit is set at the falling edge of the ninth clock to indicate the completion
of byte and acknowledgement transfers.
9.6.2
Address-detect interrupt
When the calling address matches the programmed slave address (I 2 C address register) or when the
GCAEN bit is set and a general call is received, the IAAS bit in the status register is set.
The CPU is interrupted, provided the IICIE is set. The CPU must check the SRW bit and set its Tx mode
accordingly.
9.6.3
Exit from Low-Power/Stop modes
The slave receive input detect circuit and address matching feature are still active on low-power modes
(wait and stop). An asynchronous input matching slave address or general call address brings the CPU out
of low power/stop mode if the interrupt is not masked. Therefore, TCF and IAAS both can trigger this
interrupt.
9.6.4
Arbitration-lost interrupt
The I 2 C is a true multi-master bus that allows more than one master to be connected on it. If two or more
masters try to control the bus at the same time, the relative priority of the contending masters is determined
by a data arbitration procedure. The I 2 C module asserts this interrupt when it loses the data arbitration
process and the ARBL bit in the status register is set.
Arbitration is lost in the following circumstances:
? SDA is sampled as a low when the master drives a high during an address or data transmit cycle
? SDA is sampled as a low when the master drives a high during the acknowledge bit of a data
receive cycle
? A START cycle is attempted when the bus is busy
? A repeated START cycle is requested in Slave mode
? A STOP condition is detected when the master did not request it
This bit must be cleared by software by writing a 1 to it.
MMA955xL Intelligent, Motion-Sensing Platform Hardware Reference Manual, Rev. 1.0
174
Freescale Semiconductor, Inc.
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