Renesas H8/38024 Hardware Manual page 377

RDR
RSR (reception in progress)
RXD pin
32
RDRF = 0
TDR (next transmit data)
TSR (transmission in progress)
TXD pin
32
TDRE = 0
TDR
TSR (transmission in progress)
TXD pin
32
Figure 10.2(a) RDRF Setting and RXI Interrupt
Figure 10.2(b) TDRE Setting and TXI Interrupt
TEND = 0
Figure 10.2(c) TEND Setting and TEI Interrupt
RDR
RSR↑ (reception completed, transfer)
RXD pin
32
RDRF ← 1
(RXI request when RIE = 1)
TDR
↓
TSR (transmission completed, transfer)
TXD pin
32
TDRE ← 1
(TXI request when TIE = 1)
TDR
TSR (reception completed)
TXD pin
32
Rev. 6.00, 08/04, page 347 of 628
TEND ← 1
(TEI request when TEIE = 1)