PIC12C508 Read and Write 93LC46 Sample Program

/************************************************* ***********

* Processer : MICroChip PIC12C508 *

* Compiler : Hi-TECH PICC 8.00 PL2 *

* Writer : Jason Kuo *

* DescripTIon : It CAN read/write 93LC46 (64 x 16-bit organizaTIon) *

************************************************** ***********/

staTIc volaTIle unsigned char RTCC @ 0x01;

Static volatile unsigned char TMR0 @ 0x01;

Static volatile unsigned char PCL @ 0x02;

Static volatile unsigned char STATUS @ 0x03;

Static unsigned char FSR @ 0x04;

Static volatile unsigned char OSCCAL @ 0x05;

Static volatile unsigned char GPIO @ 0x06;

Static unsigned char control OPTION @ 0x00;

Static volatile unsigned char control TRIS @ 0x06;

/* STATUS bits */

Static bit GPWUF @ (unsigned)&STATUS*8+7;

Static bit PA0 @ (unsigned)&STATUS*8+5;

Static bit TO @ @unsigned)&STATUS*8+4;

Static bit PD @ (unsigned)&STATUS*8+3;

Static bit ZERO @ (unsigned)&STATUS*8+2;

Static bit DC @ (unsigned)&STATUS*8+1;

Static bit CARRY @ (unsigned)&STATUS*8+0;

/* OPTION bits */

#define GPWU (1 "7)

#define GPPU (1 "6)

#define T0CS (1 "5"

#define T0SE (1 "4"

#define PSA (1 "3"

#define PS2 (1 "2"

#define PS1 (1 "1"

#define PS0 (1 "0"

/* OSCCAL bits */

Static volatile bit CAL3 @ (unsigned)&OSCCAL*8+7;

Static volatile bit CAL2 @ (unsigned)&OSCCAL*8+6;

Static volatile bit CAL1 @ (unsigned)&OSCCAL*8+5;

Static volatile bit CAL0 @ (unsigned)&OSCCAL*8+4;

Static volatile bit GP5 @ (unsigned)&GPIO*8+5;

Static volatile bit GP4 @ (unsigned)&GPIO*8+4;

Static volatile bit GP3 ​​@ (unsigned)&GPIO*8+3;

Static volatile bit GP2 @ (unsigned)&GPIO*8+2;

Static volatile bit GP1 @ (unsigned)&GPIO*8+1;

Static volatile bit GP0 @ (unsigned)&GPIO*8+0;

#define CONFIG_ADDR 0xFFF

/* code protection */

#define MCLREN 0xFFFF // memory clear enable

#define MCLRDIS 0xFFEF // memory clear dISAble

/*watchdog*/

#define WDTEN 0xFFFF // watchdog timer enable

#define WDTDIS 0xFFFB // watchdog timer disable

/* code protection */

#define PROTECT 0xFFF7 // protect the program code

#define UNPROTECT 0xFFFF // do not protect the program code

/*osc configurations*/

#define EXTRC 0xFFFF // external resistor/caPACitor

#define INTRC 0xFFFE // internal

#define XT 0xFFFD // crystal/resonator

#define LP 0xFFFC // low power crystal/resonator

/* 93LC46 I/O PIN define */

#define CS GP0 //Chip Select

#define CLK GP1 //Serial Data CLOCk

#define DI GP2 //Serial Data Input

#define DO GP4 //Serial Data Output

Void Delay(unsigned int counter);

Void Pulse(void);

Void StartBit(void);

Void EWEN(void);

Void EWDS(void);

Extern void Write93LC46(unsigned char Offset_Addr, unsigned int tx_data);

Extern unsigned int Read93LC46(unsigned char Offset_Addr);

Void InitPIC(void);

#define CLRWDT() asm(" clrwdt")

#define SLEEP() asm("sleep")

#define ___mkstr1(x) #x

#define ___mkstr(x) ___mkstr1(x)

#define __CONFIG(x) asm("tpsect config,class=CONFIG,delta=2");

Asm("tglobaltconfig_word");

Asm("config_word");

Asm("tdw ”___mkstr(x))

#define __IDLOC(w) asm("tpsect idloc,class=IDLOC,delta=2");

Asm("tglobaltidloc_word");

Asm("idloc_word");

Asm("tirpct__arg," ___mkstr(w));

Asm("tdw 0&__arg&h");

Asm("tendm")

__CONFIG(MCLRDIS & WDTDIS & EXTRC & PROTECT);

/*------------------------------------------------ ----

Function : Delay

Input : unsigned int (counter)

Output : None

Description : Delay routine

If counter=1 delay 35us , if counter=10 delay 134us,

If counter=100 delay 1.12ms,

These delay is base on internal 4MHz

-------------------------------------------------- ----*/

Void Delay(unsigned int counter)

{

While(counter》0) counter--;

}

/*------------------------------------------------ ----

Function : Pulse

Input : None

Output : None

Description : Send a pulse (10) to Serial Data Clock(CLK)

-------------------------------------------------- ----*/

Void Pulse(void)

{

CLK = 1;

Delay(25);

CLK = 0;

}