RDR
RDR
RSR (reception in progress)
RDRF = 0
RSR↑ (reception completed, transfer)
RXD3x pin
RXD3x pin
RDRF ← 1
(RXI request when RIE = 1)
Figure 10-7 (a) RDRF Setting and RXI Interrupt
TDR (next transmit data)
TDR
TSR (transmission in progress)
TDRE = 0
TSR↓ (transmission completed, transfer)
TXD3x pin
TXD3x pin
TDRE ← 1
(TXI request when TIE = 1)
Figure 10-7 (b) TDRE Setting and TXI Interrupt
TDR
TDR
TSR (transmission in progress)
TEND = 0
TSR (reception completed)
TXD3x pin
TXD3x pin
TEND ← 1
(TEI request when TEIE = 1)
Figure 10-7 (c) TEND Setting and TEI Interrupt
294
ETC [ ETC ]
