Section 16
Serial Pin Multiplexed Modes
Rev. 1.00 Mar. 12, 2008 Page 549 of 1178
REJ09B0403-0100
16.4.5
Serial Pin Multiplexed Mode 4
(SMR0 Register [bits SM2, SM1, SM0] = [1 0 0])
Mode 4 provides the same function as mode 3, but the data lines of SCI_3 and SCIF are cross-
connected.
RxD1/TxD1 of SCI_1 are connected to Tx/Rx of COM1, and internal register bits emulate other
signals of COM1.
DCD
/
RI
/
DSR
/
CTS
of SCIF are fixed at 1. COM2 is not available (N/A) and Rx
for COM2 is fixed at 1. COM3 is not available (N/A) and Rx for COM3 is fixed at 1. RxD3/TxD3
of SCI_3 are cross-connected to TxDF/RxDF of SCIF internally.
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 to CTS1 bit of SMR1 register.
The values written to bits DTR1/RTS1 of the SMR1 register are output to
DTR
/
RTS
of COM1.
The value written to bit RTS3 of SMR1 is reflected in
CTS
of SCIF, and the state of
RTS
of SCIF
is reflected in bit CTS3 of SMR1, allowing SCI_3 and SCIF to communicate each other with
virtual flow control.
Figure 16.5 illustrates the pin connection in serial pin multiplexed mode 4.
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
Figure 16.5 Serial Pin Multiplexed Mode 4
Содержание H8S Family
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