Silicon Laboratories Stepper Machine User Manual download pdf (Page 20)

AN428

20 Rev. 0.6

// - Added test for when the mask = 0x00 to skip that register access

// - Updated Si5338 register mask list in register_map.h

// Release 1.3 (September 2010)

// - Updated the register_map.h and main() to reflect the Si5338

// datasheet updates

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

// Includes

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

#include <compiler_defs.h>

#include <c8051F300_defs.h> // SFR declarations

#include <register_map.h>

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

// Global CONSTANTS

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

// Device address (7 bits) for slave target

// 0x70 is default for the Si5338

#define SLAVE_ADDR 0x70

#define SYSCLK 24500000 // System clock frequency in Hz

#define SMB_FREQUENCY 400000 // Target SCL clock rate

// Can be 100kHz or 400kHz

#define WRITE 0x00 // SMBus WRITE command

#define READ 0x01 // SMBus READ command

// Status vector - top 4 bits only

#define SMB_MTSTA 0xE0 // (MT) start transmitted

#define SMB_MTDB 0xC0 // (MT) data byte transmitted

#define SMB_MRDB 0x80 // (MR) data byte received

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Silicon Laboratories Stepper Machine User Manual Page 20