Rainbow-electronics MAX1402 Manual de usuario descargar pdf (Pagina 33)

MAX1402

+5V, 18-Bit, Low-Power, Multichannel,

Oversampling (Sigma-Delta) ADC

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/* Low-level function to write 8 bits

** The example shown here is for a bit-banging system with (CPOL=1, CPHA=1)

void WriteByte (BYTE x)

{

drive SCK pin high

count = 0;

while (cout <= 7)

{

if (bit 7 of x is 1)

drive DIN pin high

else

drive DIN pin low

drive SCK pin low

x = x * 2;

drive SCK pin high

count = count + 1;

}

/* Low-level function to read 8 bits

** The example shown here is for a bit-banging system with (CPOL=1, CPHA=1)

BYTE ReadByte (void)

{

x = 0;

drive SCK pin high

count = 0;

while (cout <= 7)

{

x = x * 2;

drive SCK pin low

if (DOUT pin is high)

x = x + 1;

drive SCK pin high

count = count + 1;

}

return x;

Figure 15. Bit-Banging SPI Replacement

P3.0

P3.1

RESET

DOUT

DIN

SCLK

8051

MAX1402

Figure 14. MAX1402 to 8051 Interface

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Rainbow-electronics MAX1402 Manual de usuario Pagina 33

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