Figure 6.12-9 Uart Rs-485 Aad Mode Address Match Wake-Up; Figure 6.12-10 Uart Rx Fifo Threshold Time-Out Wake-Up - Nuvoton ISD94124BYI Technical Reference Manual

Isd arm cortex-m4f soc

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UART0_RXD pin

Note: Stable count means HCLK source recovery stable count.

Figure 6.12-9 UART RS-485 AAD Mode Address Match Wake-up

RX FIFO threshold time-out wake-up:

RX FIFO Threshold Time-out Wake-up function can wake up the system if the device has not

received certain amount of data within specified time.

To enable RX FIFO Time-out Wake-up function:

Enable WKRFRTEN (UART_WKCTL[2]): RX FIFO Reached Threshold Wake-up Enable bit.

Enable WKTOUTEN (UART_WKCTL[4]): RX FIFO Time-out Wake-up Enable bit

Enable TOCNTEN (UART_INTEN[11]): RX FIFO Time-out Counter Enable bit

Configure RFITL (UART_FIFO[7:4]): RX FIFO Interrupt Trigger level

Configure TOIC (UART_TOUT[7:0]): Time-out Interrupt Comparator

Under this configuration, the time-out counter resets and starts counting incrementally whenever

RX FIFO receives new data. The counting clock frequency equals to the baud rate. When time-out

counter value equals to time-out value defined in TOIC, and the RX FIFO level does not reach the

threshold value defined in RFITL, it wakes up the system from power down mode, and flag

TOUTWKF(UART _WKSTS[4]) will be set.

Note: The UART controller clock source should be selected as LXT in Power-down mode to receive

UART0_RXD pin

Note: Stable count means HCLK source recovery stable count.

ISD94100 Series Technical Reference Manual

Power-down mode

Address Match

Power-down mode

RX FIFO number not reached

RFITL and Time-out

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stable count

stable count

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