SI598 datasheet(9/44 Pages) SILABS

Il numero della parte	SI598

Spiegazioni elettronici	ANSI C REFERENCE DESIGN WITH OPTIONAL NON-VOLATILE OUTPUT FREQUENCY

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Produttore elettronici	SILABS [Silicon Laboratories]

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AN334

Rev. 0.4

9

// values read from the Si57x/598/599

U16 CURR_FREQ;

// Holds the index of the current frequency

// being output

U32 INITIAL_RFREQ_LONG;

// RFREQ value read from the Si57x/598/599 when it

// when it is turned on

float RFREQ;

// Fractional mulitplier used to achieve

// correct output frequency

float FXTAL;

// Will hold the value of the internal crystal

// frequency

U8* pSMB_DATA_IN;

// Global pointer for SMBus data

// All receive data is written here

U8 SMB_SINGLEBYTE_OUT;

// Global holder for single byte writes.

U8* pSMB_DATA_OUT;

// Global pointer for SMBus data.

// All transmit data is read from here

U8 SMB_DATA_LEN;

// Global holder for number of bytes

// to send or receive in the current

// SMBus transfer.

U8 WORD_ADDR;

// Global holder for the

word

// address that will be accessed in

// the next transfer

U8 TARGET;

// Target SMBus slave address

//U32 FRAC_BITS;

// Double Floating Point Precision Method

volatile bit SMB_BUSY = 0;

// Software flag to indicate when the

// I2C_ByteRead() or

// I2C_ByteWrite()

// functions have claimed the SMBus

bit SMB_RW;

// Software flag to indicate the

// direction of the current transfer

bit SMB_SENDWORDADDR;

// When set, this flag causes the ISR

// to send the 8-bit <WORD_ADDR>

// after sending the slave address.

bit SMB_RANDOMREAD;

// When set, this flag causes the ISR

// to send a START signal after sending

// the word address.

// The ISR handles this

// switchover if the <SMB_RANDOMREAD>

// bit is set.

bit SMB_ACKPOLL;

// When set, this flag causes the ISR

// to send a repeated START until the

// slave has acknowledged its address

SBIT(SDA, SFR_P0, 0);

// SMBus on P0.0

SBIT(SCL, SFR_P0, 1);

// and P0.1

//-----------------------------------------------------------------------------

// Function PROTOTYPES

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