Section 16 Multiplex Mode
Rev. 1.00 Mar. 12, 2008 Page 548 of 1178
REJ09B0403-0100
16.4.4
Serial Pin Multiplexed Mode 3
(SMR0 Register [bits SM2, SM1, SM0] = [0 1 1])
This mode enables the use of COM2 by SCIF and COM1 by SCI_1. Since SCI_1 doesn’t use any
hardware pins for flow control, emulation is possible using the internal registers.
Tx/Rx of COM1 are connected to RxD1/TxD1 of SCI_1, and other COM1 port signals are
controlled or monitored through bits in the internal registers. RxDF/TxDF of SCIF are connected
to Tx/Rx of COM2 and other SCIF signals are not used.
DCD
/
RI
/
DSR
/
CTS
of SCIF are fixed at 1.
RxD3 and TxD3 of SCI_3 are connected to Tx and Rx of COM3.
The states of
DCD
/
RI
/
DSR
of COM1 are reflected in bits DCD1/RI1/DSR1 of the SMR0 register,
and
CTS
of COM1 is reflected in bit CTS1 of the SMR1 register.
The values written to bits DTR1/RTS1 of the SMR1 register are output to
DTR
/
RTS
of COM1.
Figure 16.4 illustrates the pin connection in serial pin multiplexed mode 3.
COM2
COM3
SCI_1
SCI_3
BMC (H8S)
RxD1
TxD1
RxD3
TxD3
Rx
Tx
Rx
Tx
COM1
DCD1
RI1
DSR1
SMR0
SCIF
P24
P25
P26
P27
P64
P65
P86
P87
P51
P50
P53
P52
DCD
RI
DSR
DTR
CTS
RTS
RxDF
TxDF
DCD
RI
DSR
DTR
CTS
RTS
Rx
Tx
CTS1
DTR1
RTS1
CTS3
SMR1
RTS3
1
1
1 Open 1 Open
Figure 16.4 Serial Pin Multiplexed Mode 3
Содержание H8S Family
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