Cirrus Logic AN118 - Manual (Page 9)

AN118
AN118REV2 9
7. APPENDIX: 80C51 MICROCONTROLLER CODE
/*CS5521/22/23/24/28 Runtime Constants and Prototypes*/
/*PROTOTYPES*/
void initialize(void);
void decode_command(char command);
void decode_sample_index(void);
void TXSER(char);
char RXSER(void);
char receive_byte(void);
void transfer_byte(char);
void write_to_register(char command,char low,char mid, char high);
void read_register(char command);
void read_conversion(char command);
void Delay(void);
void test_mode(void);
void toggle_all_leds(void);
void toggle_two_leds(void);
/* BYTE Register equates for the register ports */
sfr P0
= 0x80;
sfr P1 = 0x90;
sfr P2 = 0xA0;
sfr P3 = 0xB0;
sfr PSW = 0xD0;
sfr ACC = 0xE0;
sfr B = 0xF0;
sfr SP = 0x81;
sfr DPL = 0x82;
sfr DPH = 0x83;
sfr PCON = 0x87;
sfr TCON = 0x88;
sfr TMOD = 0x89;
sfr TL0 = 0x8A;
sfr TL1 = 0x8B;
sfr TH0 = 0x8C;
sfr TH1 = 0x8D;
sfr IE = 0xA8;
sfr IP = 0xB8;
sfr SCON = 0x98;
sfr SBUF = 0x99;
/*PORT 1 equates*/
sbit CS
= 0x90 ; /* Chip Select */
sbit SDI = 0x91 ; /* Serial Data In */
sbit SDO = 0x92 ; /* Serial Data Out */