I2C BUS INTERFACE
2
I C BUS INTERFACE (Cont’d)
INTERRUPT MASK REGISTER (I2CIMR)
R255 - Read / Write
Register Page: 20 (I2C_0) or 22 (I2C_1)
Reset Value: 00xx 0000 (x0h)
interrupt request.
Note: TEOBP can only be written to “0”.
0: End of block not reached
1: End of data block in DMA transmitter detected.
7
0
Bit 3 = Reserved. This bit must be cleared.
RXDM TXDM REOBP TEOBP
0
IERRM IRXM ITXM
Bit 2 = IERRM Error Condition interrupt mask bit.
This bit enables/ disables the Error interrupt.
0: Error interrupt disabled.
Bit 7 = RXDM Receiver DMA Mask.
0: DMA reception disable.
1: DMA reception enable
1: Error Interrupt enabled.
RXDM is reset by hardware when the transaction
counter value decrements to zero, that is when a
Receiver End Of Block interrupt is issued.
Bit 1 = IRXM Data Received interrupt mask bit.
This bit enables/ disables the Data Received and
Receive DMA End of Block interrupts.
0: Interrupts disabled
Bit 6 = TXDM Transmitter DMA Mask.
0: DMA transmission disable.
1: DMA transmission enable.
TXDM is reset by hardware when the transaction
counter value decrements to zero, that is when a
Transmitter End Of Block interrupt is issued.
1: Interrupts enabled
Note: This bit has no effect on DMA transfer
Bit 0 = ITXM Peripheral Ready To Transmit inter-
rupt mask bit.
This bit enables/ disables the Peripheral Ready To
Transmit and Transmit DMA End of Block inter-
rupts.
Bit 5 = REOBP Receiver DMA End Of Block Flag.
REOBP should be reset by software in order to
avoid undesired interrupt routines, especially in in-
itialization routine (after reset) and after entering
the End Of Block interrupt routine.Writing “0” in
this bit will cancel the interrupt request
0: Interrupts disabled
1: Interrupts enabled
Note: This bit has no effect on DMA transfer.
Note: REOBP can only be written to “0”.
0: End of block not reached.
1: End of data block in DMA receiver detected
Bit 4 = TEOBP Transmitter DMA End Of Block TE-
OBP should be reset by software in order to avoid
undesired interrupt routines, especially in initializa-
tion routine (after reset) and after entering the End
Of Block interrupt routine.Writing “0” will cancel the
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STMICROELECTRONICS [ ST ]
