I2C_C1 field descriptions (continued)
Field
Description
3
TXAK
Transmit Acknowledge Enable
Specifies the value driven onto the SDA during data acknowledge cycles for both master and slave
receivers. The value of SMB[FACK] affects NACK/ACK generation.
NOTE: SCL is held low until TXAK is written.
0
An acknowledge signal is sent to the bus on the following receiving byte (if FACK is cleared) or the
current receiving byte (if FACK is set).
1
No acknowledge signal is sent to the bus on the following receiving data byte (if FACK is cleared) or
the current receiving data byte (if FACK is set).
2
RSTA
Repeat START
Writing 1 to this bit generates a repeated START condition provided it is the current master. This bit will
always be read as 0. Attempting a repeat at the wrong time results in loss of arbitration.
1
WUEN
Wakeup Enable
The I2C module can wake the MCU from low power mode with no peripheral bus running when slave
address matching occurs.
0
Normal operation. No interrupt generated when address matching in low power mode.
1
Enables the wakeup function in low power mode.
0
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
18.3.4 I2C Status register (I2C_S)
Address: 3070h base + 3h offset = 3073h
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
1
0
0
0
0
0
0
0
I2C_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:
Table continues on the next page...
Chapter 18 Inter-Integrated Circuit (I2C)
MC9S08PT60 Reference Manual, Rev. 4, 08/2014
Freescale Semiconductor, Inc.
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Содержание MC9S08PT60
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