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uPD789074 Subseries 8-Bit Single-Chip Microcontrollers UD - Home

uPD789074 Subseries 8-Bit Single-Chip Microcontrollers UD - Home

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CHAPTER 9 SERIAL INTERFACE 20Figure 9-11. 3-Wire Serial I/O Mode Timing (3/7)(iv) Master operation (when DAP20 = 0, CKP20 = 1, SSE20 = 0)SIO20WriteSCK201 2 3 4 5 6 7 8SO20DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0SI20DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0INTCSI20(v) Slave operation (when DAP20 = 0, CKP20 = 1, SSE20 = 0)SIO20WriteSCK201 2 3 4 5 6 7 8SIO20 Write (master) NoteSI20DI7 DI6 DI5 DI4 DI3 DI2 DI1 DI0SO20DO7 DO6 DO5 DO4 DO3 DO2 DO1 DO0INTCSI20Note The data of SI20 is loaded at the first rising edge of SCK20. Make sure that the master outputs thefirst bit before the first rising of SCK20.User’s Manual U14801EJ3V1<strong>UD</strong> 145

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