I2Cx_C1 field descriptions (continued)
Field
Description
If any address matching occurs, S[IAAS] and S[TCF] are set. If the direction of transfer is known from
master to slave, then it is not required to check S[SRW]. With this assumption, DMA can also be used
in this case. In other cases, if the master reads data from the slave, then it is required to rewrite the
C1 register operation. With this assumption, DMA cannot be used.
When FACK = 1, an address or a data byte is transmitted.
36.3.4 I2C Status register (I2Cx_S)
Address: Base a 3h offset
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
1
0
0
0
0
0
0
0
I2Cx_S field descriptions
Field
Description
7
TCF
Transfer Complete Flag
Acknowledges a byte transfer; TCF is set on the completion of a byte transfer. This bit is valid only during
or immediately following a transfer to or from the I2C module. TCF is cleared by reading the I2C data
register in receive mode or by writing to the I2C data register in transmit mode.
0
Transfer in progress
1
Transfer complete
6
IAAS
Addressed As A Slave
This bit is set by one of the following conditions:
• The calling address matches the programmed primary slave address in the A1 register, or matches
the range address in the RA register (which must be set to a nonzero value and under the condition
I2C_C2[RMEN] = 1).
• C2[GCAEN] is set and a general call is received.
• SMB[SIICAEN] is set and the calling address matches the second programmed slave address.
• ALERTEN is set and an SMBus alert response address is received
• RMEN is set and an address is received that is within the range between the values of the A1 and
RA registers.
IAAS sets before the ACK bit. The CPU must check the SRW bit and set TX/RX accordingly. Writing the
C1 register with any value clears this bit.
0
Not addressed
1
Addressed as a slave
5
BUSY
Bus Busy
Indicates the status of the bus regardless of slave or master mode. This bit is set when a START signal is
detected and cleared when a STOP signal is detected.
Table continues on the next page...
Memory map/register definition
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
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Freescale Semiconductor, Inc.
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