UPD784054 datasheet(35/86 Pages) NEC

Part #	UPD784054

Description	16-BIT SINGLE-CHIP MICROCONTROLLER

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Manufacturer	NEC [NEC]

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µPD784054(A)

35

(2) 3-wire serial I/O mode

This mode is to start transmission when the master device makes a serial clock active and to communicate

1-byte data in synchronization with this clock.

The interface in this mode communicates with devices that have conventional clocked serial interface.

Basically, communication is performed by using three lines: serial clock (SCK) and two serial data (SI and

SO) lines. To connect two or more devices, a handshake line is necessary.

Figure 7-8. Block Diagram in 3-Wire Serial I/O Mode

Internal bus

Direction control circuit

Shift register

SIO1, SIO2

Output latch

Serial clock counter

Interrupt

generation circuit

INTCSI1,

INTCSI2

Serial clock

control circuit

1/2m

1/2n+1

fCLK

SI1, SI2

SO1, SO2

SCK1, SCK2

Remark

fCLK: internal system clock

n = 0 to 11

m = 1, 16 to 30

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