Datasheet

Section 16 Serial Pin Multiplexed Modes
Rev. 2.00 Aug. 20, 2008 Page 547 of 1198
REJ09B0403-0200
16.4 Operation of Serial Pin Multiplexed Modes
16.4.1 Serial Pin Multiplexed Mode 0
(Default; SMR0 Register [bits SM2, SM1, SM0] = [0 0 0])
This mode is the default configuration and each COM port is used for its respective serial
communication module: COM1 works with SCIF, COM2 with SCI_1, and COM3 with SCI_3.
DCD, RI, DSR, DTR, CTS, RTS, RxDF, and TxDF of SCIF are connected to the corresponding
pins of COM1. Tx/Rx of COM1 are tied across to RxDF/TxDF (cross connection).
RxD1 and TxD1 of SCI_1 are cross-connected to COM2. RxD3 and TxD3 of SCI_3 are cross-
connected to COM3.
Figure 16.1 illustrates the pin connection in serial pin multiplexed mode 0.
COM2 COM3
SCI_1 SCI_3
BMC (H8S)
RxD1
TxD1
RxD3
TxD3
Rx Tx Rx Tx
COM1
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
Figure 16.1 Serial Pin Multiplexed Mode 0