Rainbow-electronics AT73C246 Manual do Utilizador descarregar pdf (Página 132)

132

11050A–PMAAC–07-Apr-10

AT73C246

14. PMU and Audio Soft Control: Quick Start

14.1 RTC Examples

14.1.1 RTC Oscillator POWER-ON

// Set OSC_EN = 1 and OSC_UPDT = 1

TWI_WRITE 0x0C @BACKUP_CTRL

// Wait > 200us.

WAIT 200us

// Set OSC_UPDT = 0

TWI_WRITE 0x04 @BACKUP_CTRL

// Read BACKUP_CTRL to verify OSC_STAT bit. Result = 0x06.

TWI_READ @BACKUP_CTRL

14.1.2 RTC Oscillator POWER-OFF

// Set OSC_EN = 0 and OSC_UPDT = 1

TWI_WRITE 0x08 @BACKUP_CTRL

// Wait 200us

WAIT 200us

// Set OSC_UPDT = 0

TWI_WRITE 0x00 @BACKUP_CTRL

// Read BACKUP_CTRL to verify OSC_STAT bit. Result = 0x00.

TWI_READ @BACKUP_CTRL

14.1.3 RTC Domain RESET

// Set RST_BKUP = 1

TWI_WRITE 0x01 @BACKUP_CTRL

// Wait 200s

WAIT 200us

// Set RST_BKUP = 0

TWI_WRITE 0x00 @BACKUP_CTRL

Note: Reset of the RTC domain powers off the RTC oscillator.

14.1.4 RTC Write Operation

The following example makes a generic 32-bit write operation into the RTC macro. The 32-bit

data is split into 4 bytes, that are successively sent over the TWI.

unsigned int RTC_DATA;

char DATA0 = (char) (RTC_DATA); // LSBs

char DATA1 = (char) (RTC_DATA >> 8);

char DATA2 = (char) (RTC_DATA >> 16);

char DATA3 = (char) (RTC_DATA >> 24); // MSBs

// Select RTC_ADDR = ADDR. ADDR is the RTC macro register to write,

TWI_WRITE ADDR @RTC_ADDR

// Set RTC_DATA0 to RTC_DATA4 registers.

TWI_WRITE DATA0 @RTC_DATA0

TWI_WRITE DATA1 @RTC_DATA1

1 2 ... 127 128 129 130 131 132 133 134 135 136 137 ... 158 159

Comentários a estes Manuais

Sem comentários

Rainbow-electronics AT73C246 Manual do Utilizador Página 132

Comentários a estes Manuais

Manuais e produtos relacionados com Sensores Rainbow-electronics AT73C246