NXP Semiconductors K22F series, Reference Manual, Page: 1339 / 1407

In Stop mode, if the Transmitter Stop Enable (TCSR[STOPE]) bit is clear, the transmitter
is disabled after completing the current transmit frame, and, if the Receiver Stop Enable
(RCSR[STOPE]) bit is clear, the receiver is disabled after completing the current receive
frame. Entry into Stop mode is prevented–not acknowledged–while waiting for the
transmitter and receiver to be disabled at the end of the current frame.
49.1.3.3 Low-leakage modes
When entering low-leakage modes, the Stop Enable (TCSR[STOPE] and
RCSR[STOPE]) bits are ignored and the SAI is disabled after completing the current
transmit and receive Frames. Entry into stop mode is prevented (not acknowledged)
while waiting for the transmitter and receiver to be disabled at the end of the current
frame.
49.1.3.4 Debug mode
In Debug mode, the SAI transmitter and/or receiver can continue operating provided the
Debug Enable bit is set. When TCSR[DBGE] or RCSR[DBGE] bit is clear and Debug
mode is entered, the SAI is disabled after completing the current transmit or receive
frame. The transmitter and receiver bit clocks are not affected by Debug mode.
49.2 External signals
Name Function I/O
SAI_TX_BCLK Transmit Bit Clock. The bit clock is an input when
externally generated and an output when
internally generated. I/O
SAI_TX_SYNC Transmit Frame Sync. The frame sync is an input
sampled synchronously by the bit clock when
externally generated and an output generated
synchronously by the bit clock when internally
generated. I/O
SAI_TX_DATA Transmit Data. The transmit data is generated
synchronously by the bit clock and is tristated
whenever not transmitting a word. O
SAI_RX_BCLK Receive Bit Clock. The bit clock is an input when
externally generated and an output when
internally generated. I/O
SAI_RX_SYNC Receive Frame Sync. The frame sync is an input
sampled synchronously by the bit clock when I/O
Table continues on the next page...
Chapter 49 Integrated Interchip Sound (I2S) / Synchronous Audio Interface (SAI)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 1339