Renesas H8 Series Hardware Manual page 401

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
TEND = 0
Figure 10.2(a) RDRF Setting and RXI Interrupt
Figure 10.2(b) TDRE Setting and TXI Interrupt
Figure 10.2(c) TEND Setting and TEI Interrupt
Section 10 Serial Communication Interface
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
TEND ← 1
(TEI request when TEIE = 1)
Rev. 7.00 Mar 10, 2005 page 359 of 652
REJ09B0042-0700