Silicon Laboratories Stepper Machine Manuale Utente Scaricare il pdf (Pagina 21)

AN155

Rev. 1.1 21

Figure D4. UART ISR

UART_ISR

receiver

interrupt flag

set?

receive buffer

full?

clear receiver flag.

read SBUF sfr.

put into readBuffer.

Increment readIndex.

Increment ReadCount.

transmitter

interrupt flag

set?

transmit buffer

empty?

clear transmitter flag.

get last char in WriteBuffer.

write to SBUF sfr.

decrement WriteCount.

drop character.

(dummy read)

Set TX_Idle flag

Return from

Interrupt.

Y

Y

Y

Y

N

N

N

N

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