Figure 13.25 Operation Of Communication Using The Sci Select Function - Hitachi H8S/2215 Series Hardware Manual

Communication between master LSI and slave LSI_A
Master LSI
M_SCK
M_TxD
M_RxD
*
*
Slave LSI_A
( )
SCK0_A
RSR0_A
Hi-Z
TxD0_A
Slave LSI_B
( )
SCK0_B
RSR0_B
TxD0_B
Note: * The selection signals (SEL_A and SEL_B) of the LSI must be switched while the serial
clock (M_SCK) is high after the end bit of the transmit data has been send. Note that one
selection signal can be brought low at the same time.

Figure 13.25 Operation of Communication Using the SCI Select Function

D0 D1
D0 D1
D0 D6
D0 D1
Fixed high level
Hi-Z
Communication between master LSI and slave LSI_B
Period of M_SCK = high*
D7 D0
D7 D0
D7
D7
D0
D0
D1 D7
D1 D7
Fixed high level
Hi-Z
D6
D1 D7
Rev. 3.0, 10/02, page 407 of 686
D7
Hi-Z