NEC 78014Y Series User Manual page 265

8-bit single-chip microcontrollers

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(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 or SB1).

This mode enables to cope with any one of the possible data transfer formats by controlling the SCK0 level and

the SB0 or SB1 output level. Thus, the handshake line previously necessary for connection of two or more devices

can be removed, resulting in an increased number of available input/output ports.

CHAPTER 15 SERIAL INTERFACE CHANNEL 0 ( µ PD78014 Subseries)

Figure 15-1. Serial Bus Interface (SBI) System Configuration Example