289CHAPTER 16 SERIAL INTERFACE CHANNEL 0 (μPD78054 Subseries)(4) 2-wire serial I/O mode (MSB-first)This mode is used for 8-bit data transfer using two lines of serial clock (SCK0) and serial data bus (SB0 orSB1).This mode enables to cope with any one of the possible data transfer formats by controlling the SCK0 leveland the SB0 or SB1 output level. Thus, the handshake line previously necessary for connection of two ormore devices can be used as input/output ports.Figure 16-1. Serial Bus Interface (SBI) System Configuration ExampleMaster CPUSCK0SB0SCK0SB0Slave CPU1SCK0SB0Slave CPU2SCK0SB0Slave CPUnV DD
