Datasheet

Section 16 Serial Pin Multiplexed Modes
Rev. 2.00 Sep. 28, 2009 Page 445 of 870
REJ09B0429-0200
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 RTS/Rx
of COM1 are fixed at 1. CTS, RTS, RxDF, and TxDF of SCIF are disconnected from COM1.
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.
COM3
SCI_1 SCI_3
BMC (H8S)
RxD1
TxD1
RxD3
TxD3
Rx Tx
SCIF
P64 P65
P86 P87
P51
P50 P53 P52
CTS RTS RxDF TxDF
CTS1
RTS1
CTS3
SMR1
RTS3
Figure 16.3 Serial Pin Multiplexed Mode 2