NEC PD75P402 Manual do Utilizador descarregar pdf (Página 102)

CHAPTER 5. PERIPHERAL HARDWARE FUNCTIONS

(7) 3-wire serial I/O mode applications

(a) To transfer data MSB-first (master operation) using a 262 kHz transfer clock (when operating at 4.19 MHz).

MOV XA, #10000010B

MOV CSIM, XA ; Transfer mode setting

MOV XA, TDATA ; TDATA is transfer data storage address

MOV SIO, XA ; Transfer data setting & start of transfer

Note From the second time onward, the transfer can be started by setting data in SIO (MOV SIO, XA or XCH XA,

SIO).

SCK

PD75402A

SO/SB0

SCK

In this application the

PD75402A SI pin can be used as an input port.

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NEC PD75P402 Manual do Utilizador Página 102