34.6.5.9 Status
| Symbol | Description | Symbol | Description | Symbol | Description |
|---|---|---|---|---|---|
| R | Readable bit | HC | Cleared by Hardware | (Grey cell) | Unimplemented |
| W | Writable bit | HS | Set by Hardware | X | Bit is unknown at Reset |
| K | Write to clear | S | Software settable bit | — | — |
| Name: | STATUS |
| Offset: | 0x1A |
| Reset: | 0x0000 |
| Property: | - |
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| Access | |||||||||
| Reset |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| ITER | TXE | COLL | ISF | CTS | BUFOVF | FERR | PERR | ||
| Access | R/W | R/W | R/W | R/W | R | R/W | R/W | R/W | |
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Bit 7 – ITER Maximum Number of Repetitions Reached
This bit is set when the maximum number of NACK repetitions or retransmissions is met in ISO7816 T=0 mode.
Writing '0' to this bit has no effect.
Writing '1' to this bit will clear it.
| Value | Description |
|---|---|
| 0 | Max. # of iterations not reached |
| 1 | Max # of iterations reached |
Bit 6 – TXE Transmitter Empty
When CTRLA.FORM is set to LIN host mode, this bit is set when any ongoing transmission is complete and TxDATA is empty.
When CTRLA.FORM is not set to LIN host mode, this bit will always read back as zero.
Writing '0' to this bit has no effect.
Writing '1' to this bit will clear it.
| Value | Description |
|---|---|
| 0 | Transmission not complete, transmitter not empty |
| 1 | Transmission Complete, transmitter empty |
Bit 5 – COLL Collision Detected
This bit is cleared by writing '1' to the bit or by disabling the receiver.
This bit is set when collision detection is enabled (CTRLB.COLDEN) and a collision is detected.
Writing '0' to this bit has no effect.
Writing '1' to this bit will clear it.
| Value | Description |
|---|---|
| 0 | No collisions detected |
| 1 | Collision detected |
Bit 4 – ISF Inconsistent Sync Field
This bit is cleared by writing '1' to the bit or by disabling the receiver.
This bit is set when the frame format is set to auto-baud (CTRLA.FORM = 0x4 or 0x5) and a sync field not equal to 0x55 is received.
Writing '0' to this bit has no effect.
Writing '1' to this bit will clear it.
| Value | Description |
|---|---|
| 0 | No inconsistent sync fields |
| 1 | Inconsistent sync field received |
Bit 3 – CTS Clear to Send
This bit indicates the current level of the CTS pin when flow control is enabled (CTRLA.TXPO).
| Value | Description |
|---|---|
| 0 | CTS low |
| 1 | CTS high |
Bit 2 – BUFOVF Buffer Overflow
Reading this bit before reading the Data register will indicate the error status of the next character to be read.
This bit is cleared by writing '1' to the bit or by disabling the receiver.
This bit is set when a buffer overflow condition is detected. A buffer overflow occurs when the receive buffer is full, there is a new character waiting in the receive shift register and a new start bit is detected.
Writing '0' to this bit has no effect.
Writing '1' to this bit will clear it.
| Value | Description |
|---|---|
| 0 | No buffer overflow |
| 1 | Buffer Overflow |
Bit 1 – FERR Frame Error
Reading this bit before reading the Data register will indicate the error status of the next character to be read.
This bit is cleared by writing '1' to the bit or by disabling the receiver.
This bit is set if the received character had a frame error, i.e., when the first stop bit is zero.
Writing '0' to this bit has no effect.
Writing '1' to this bit will clear it.
| Value | Description |
|---|---|
| 0 | No Frame Errors |
| 1 | Frame Error received |
Bit 0 – PERR Parity Error
Reading this bit before reading the Data register will indicate the error status of the next character to be read.
This bit is cleared by writing '1' to the bit or by disabling the receiver.
This bit is set if parity checking is enabled (CTRLA.FORM is 0x1, 0x5, or 0x7) and a parity error is detected.
Writing '0' to this bit has no effect.
Writing '1' to this bit will clear it.
| Value | Description |
|---|---|
| 0 | No Parity Errors |
| 1 | Parity Error detected |