Serial Pin Multiplexed Mode - Renesas H8S Family Hardware Manual

16.4.3

Serial Pin Multiplexed Mode 2

(SMR0 Register [bits SM2, SM1, SM0] = [0 1 0])
In this mode, SCIF and SCI_1 are internally connected. COM1 is not available (N/A) and
DTR/RTS/Rx of COM1 are fixed at 1. DCD, RI, DSR, DTR, CTS, RTS, RxDF, and TxDF of
SCIF are disconnected from COM1. DCD/RI/DSR of SCIF is fixed at 1, and RxDF/TxDF of SCIF
are cross-connected to TxD1/RxD1 of SCI_1 internally.
COM2 is not available (N/A) and Rx of COM2 is fixed at 1. RxD3 and TxD3 of SCI_3 are
connected to Tx and Rx of COM3.
The value written to bit RTS1 of the SMR1 register is reflected in the CTS input of SCIF. The
state of RTS of SCIF is reflected in bit CTS1 of the SMR1 register.
Figure 16.3 illustrates the pin connection in serial pin multiplexed mode 2.
SMR0
DCD1
RI1
DSR1
1 1 1 Open
SCIF
Figure 16.3 Serial Pin Multiplexed Mode 2
Section 16 Serial Pin Multiplexed Modes
SMR1
CTS1
DTR1
RTS1
CTS3
RTS3
SCI_1
BMC (H8S)
Rev. 1.00 Mar. 12, 2008 Page 547 of 1178
COM3
SCI_3
REJ09B0403-0100