Information

Table 10-31. I
2
S 0 Signal Descriptions
Chip signal name Module signal
name
Description I/O
I2S0_MCLK — Serial master clock output I/O
I2S0_RX_BCLK SRCK Serial receive clock. SRCK can be used as an input or output.
• In asynchronous mode the receiver uses this clock signal
and it is always continuous.
• In synchronous mode, the STCK port is used instead for
clocking in data.
I/O
I2S0_RX_FS SRFS Serial receive frame Sync. The SRFS port can be used as an input
or output. The frame sync is used by the receiver to synchronize
the transfer of data. The frame sync signal can be one bit or one
word in length and can occur one bit before the transfer of data or
right at the transfer of data. If SRFS is configured as an input, the
external device should drive SRFS during the rising edge of STCK
or SRCK.
I/O
I2S0_RXD SRXD Serial receive data. The SRXD port is an input and is used to bring
serial data into the receive data shift register.
I
I2S0_TX_BCLK STCK Serial transmit clock. The STCK port can be used as an input or
output. This clock signal is used by the transmitter and can be
continuous or gated. During gated clock mode, data on STCK is
valid only during the transmission of data. Otherwise, it is pulled to
the inactive state. In synchronous mode, this port is used by the
transmit and receive sections.
I/O
I2S0_TX_FS STFS Serial transmit frame sync. The STFS port can be used as an input
or output. The frame sync is used by the transmitter to synchronize
the transfer of data. The frame sync signal can be one bit or one
word in length and can occur one bit before the transfer of data or
right at the transfer of data. In synchronous mode, this port is used
by both the transmit and receive sections. In gated clock mode,
frame sync signals are not used. If STFS is configured as an input,
the external device should drive STFS during the rising edge of
STCK if TSCKP is positive-edge triggered. The external device
should drive STFS during the falling edge of STCK if TSCKP is
negative-edge triggered.
I/O
I2S0_TXD STXD Serial transmit data. The STXD port is an output and transmits data
from the serial transmit shift register. The STXD port is an output
port when data is being transmitted and is disabled between data
word transmissions and on the trailing edge of the bit clock after
the last bit of a word is transmitted.
O
10.4.7 Human-Machine Interfaces (HMI)
Table 10-32. GPIO Signal Descriptions
Chip signal name Module signal
name
Description I/O
PTA[31:0]
1
PORTA[31:0] General purpose input/output I/O
Table continues on the next page...
Module Signal Description Tables
K20 Sub-Family Reference Manual, Rev. 6, Nov 2011
236 Freescale Semiconductor, Inc.