ISD91200 Series Technical Reference Manual
Release Date: Sep 16, 2019
- 326 -
Revision 2.4
[18]
TXTHIF
Transmit FIFO Threshold Flag (Read Only)
When data word(s) in transmit FIFO is less than or equal to the threshold value set
in TXTH[2:0] the TXTHIF bit becomes to 1. It remains set until transmit FIFO level is
greater than TXTH[2:0]. Cleared by writing to I2S_TX register until threshold
exceeded.
0 = Data word(s) in FIFO is greater than threshold level.
1 = Data word(s) in FIFO is less than or equal to threshold level.
[17]
TXOVIF
Transmit FIFO Overflow Flag (Write ‘1’ to Clear)
This flag is set if data is written to transmit FIFO when it is full.
0 = No overflow.
1 = Overflow.
[16]
TXUDIF
Transmit FIFO Underflow Flag (Write ‘1’ to Clear)
This flag is set if I2S controller requests data when transmit FIFO is empty.
0 = No underflow.
1 = Underflow.
[15:13]
Reserved
Reserved.
[12]
RXEMPTY
Receive FIFO Empty (Read Only)
This is set when receive FIFO is empty.
0 = Not empty.
1 = Empty.
[11]
RXFULL
Receive FIFO Full (Read Only)
This bit is set when receive FIFO is full.
0 = Not full.
1 = Full.
[10]
RXTHIF
Receive FIFO Threshold Flag (Read Only)
When data word(s) in receive FIFO is greater than or equal to threshold value set in
RXTH[2:0] the RXTHIF bit becomes to 1. It remains set until receive FIFO level is
less than RXTH[2:0]. It is cleared by reading I2S_RX until threshold satisfied.
0 = Data word(s) in FIFO is less than threshold level.
1 = Data word(s) in FIFO is greater than or equal to threshold level.
[9]
RXOVIF
Receive FIFO Overflow Flag (Write ‘1’ to Clear)
This flag is set if I2S controller writes to receive FIFO when it is full. Audio data is
lost.
0 = No overflow.
1 = Overflow.
[8]
RXUDIF
Receive FIFO Underflow Flag (Write ‘1’ to Clear)
This flag is set if attempt is made to read receive FIFO while it is empty.
0 = No underflow.
1 = Underflow.
[7:4]
Reserved
Reserved.
[3]
RIGHT
Right Channel Active (Read Only)
This bit indicates current data being transmitted/received belongs to right channel
0 = Left channel.
1 = Right channel.
