45.7.20 TWIHS FIFO Mode Register
This registers reads “0” if the FIFO is disabled (see TWI_CR to enable/disable the internal FIFO).
| Name: | TWIHS_FMR |
| Offset: | 0x50 |
| Reset: | 0x00000000 |
| Property: | Read/Write |
| Bit | 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | |
| RXFTHRES[5:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | |||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | |||
| Bit | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | |
| TXFTHRES[5:0] | |||||||||
| Access | R/W | R/W | R/W | R/W | R/W | R/W | |||
| Reset | 0 | 0 | 0 | 0 | 0 | 0 | |||
| Bit | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | |
| Access | |||||||||
| Reset |
| Bit | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | |
| RXRDYM[1:0] | TXRDYM[1:0] | ||||||||
| Access | R/W | R/W | R/W | R/W | |||||
| Reset | 0 | 0 | 0 | 0 | |||||
Bits 29:24 – RXFTHRES[5:0] Receive FIFO Threshold
| Value | Description |
|---|---|
| 0–16 |
Defines the Receive FIFO threshold value (number of data). RXFTH flag in TWIHS_FSR will be set when Receive FIFO goes from “below” threshold state to “equal or above” threshold state. |
Bits 21:16 – TXFTHRES[5:0] Transmit FIFO Threshold
| Value | Description |
|---|---|
| 0–16 |
Defines the Transmit FIFO threshold value (number of data). TXFTH flag in TWIHS_FSR will be set when Transmit FIFO goes from “above” threshold state to “equal or below” threshold state. |
Bits 5:4 – RXRDYM[1:0] Receiver Ready Mode
If FIFOs are enabled, the RXRDY flag (in TWIHS_SR) behaves as follows.
| Value | Name | Description |
|---|---|---|
| 0 | ONE_DATA |
RXRDY will be at level ‘1’ when at least one unread data is in the Receive FIFO |
| 1 | TWO_DATA |
RXRDY will be at level ‘1’ when at least two unread data are in the Receive FIFO |
| 2 | FOUR_DATA |
RXRDY will be at level ‘1’ when at least four unread data are in the Receive FIFO |
Bits 1:0 – TXRDYM[1:0] Transmitter Ready Mode
If FIFOs are enabled, the TXRDY flag (in TWIHS_SR) behaves as follows.
| Value | Name | Description |
|---|---|---|
| 0 | ONE_DATA |
TXRDY will be at level ‘1’ when at least one data can be written in the Transmit FIFO |
| 1 | TWO_DATA |
TXRDY will be at level ‘1’ when at least two data can be written in the Transmit FIFO |
| 2 | FOUR_DATA |
TXRDY will be at level ‘1’ when at least four data can be written in the Transmit FIFO |