Keyboard and Watchdog Program Examples
References
•
Atmel 8051 Microcontrollers Hardware Manual
8051
Microcontrollers
Application Note
Rev. 4362A–80C51–07/04
1
1. Introduction
This Application Note provides to customers C and Assembler program examples for
other features : Watchdog, Keyboard.
2
4362A–80C51–07/04
2. C Examples
2.1 Watchdog
/**
* @file $RCSfile: TWI.c,v $
*
* Copyright (c) 2004 Atmel.
*
* Please read file license.txt for copyright notice.
*
* @brief This file is an example to use Watchdog.
*
* This file can be parsed by Doxygen for automatic documentation
* generation.
* Put here the functional description of this file within the software
* architecture of your program.
*
* @version $Revision: 1.0 $ $Name:
$
*/
/* @section
I N C L U D E S */
#include "reg_C51.h"
/**
* FUNCTION_PURPOSE:this function setup Watchdog.
* FUNCTION_INPUTS:void
* FUNCTION_OUTPUTS:void
*/
void main(void)
{
/*
Selected Time-out
mode X1 12 clock periods per peripheral clock cycle.
mode X2
6 clock periods per peripheral clock cycle.
WDTPRG|=0x00
(2^14 - 1) machine cycles, 16. 3 ms @ FOSCA =12 MHz
WDTPRG|=0x01
(2^15 - 1) machine cycles, 32.7 ms @ FOSCA=12 MHz
WDTPRG|=0x02
(2^16 - 1) machine cycles, 65. 5 ms @ FOSCA=12 MHz
WDTPRG|=0x03
(2^17 - 1) machine cycles, 131 ms @ FOSCA=12 MHz
WDTPRG|=0x04
(2^18 - 1) machine cycles, 262 ms @ FOSCA=12 MHz
WDTPRG|=0x05
(2^19 - 1) machine cycles, 542 ms @ FOSCA=12 MHz
WDTPRG|=0x06
(2^20 - 1) machine cycles, 1.05 s @ FOSCA=12 MHz
WDTPRG|=0x07
(2^21 - 1) machine cycles, 2.09 s @ FOSCA=12 MHz
*/
WDTPRG|=0x07;/*2.275s @ FOSCA=11.059200 MHz */
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4362A–80C51–07/04
/* watchdog start sequence */
WDTRST=0x1E;
WDTRST=0xE1;
while(1)
/* end less */
{
/***********************************************
*
PROGRAM
*
************************************************/
/* watchdog reset sequence */
WDTRST=0x1E;
WDTRST=0xE1;
}
}
4
4362A–80C51–07/04
2.2 Keyboard
/**
* @file $RCSfile: keyboard.c,v $
*
* Copyright (c) 2004 Atmel.
*
* Please read file license.txt for copyright notice.
*
* @brief This file is an example to use keyboard.
*
* This file can be parsed by Doxygen for automatic documentation
* generation.
* Put here the functional description of this file within the software
* architecture of your program.
*
* @version $Revision: 1.0 $ $Name:
$
*/
/* @section
I N C L U D E S */
#include "reg_C51.h"
/*_____ D E C L A R A T I O N ___________________________________________*/
unsigned int keypressed;
/* key pressed value */
bit key_flag;
/* software flag */
/**
* FUNCTION_PURPOSE:this function setup keyboard.
* A key set idle mode and an other set the power-down mode
* In this two mode the microcontoleur wake up at keyboard event
* FUNCTION_INPUTS:void
* FUNCTION_OUTPUTS:void
*/
void
main()
{
EA=1; /* enable interrupts */
/* init keyboard */
KBE=0xFF;
/*Enable all P1 I/O as keyboard IO */
KBF=0x00;
/* Clear all keyboard flags */
IEN1 |=0x01;
/* Enable keyboard interupt */
while(1)
/* endless */
{
if (key_flag)
/* keyboard occur */
{
if ( keypressed==16)
/*enter Idle mode */
{
/* Entering Idle Mode */
PCON |=0x01;
/* Wake up by keypressed value */
}
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4362A–80C51–07/04
if ( keypressed==32)
/* enter powerdown mode */
{
/* Entering PowerDown Mode */
PCON |=0x02;
/* Wake up by keypressed value */
}
key_flag=0;
/* reset softaware flag */
}
}
}
/**
* FUNCTION_PURPOSE:keyboard_interrupt. Save pressed key
* FUNCTION_INPUTS:void
* FUNCTION_OUTPUTS:void
*/
void keyboard_interrupt() interrupt 7 using 1
{
keypressed=KBF;
/* save pressed key */
key_flag=1;
/* set the software flag */
KBF=0x00;
/* clear keyboard flags */
}
6
4362A–80C51–07/04
2.3 SFR Register Definition
/*H*************************************************************************
**
* NAME: AT89C51XD2.h
*--------------------------------------------------------------------------* PURPOSE: SFR Description file for AT89C51xD2 products
*
ON KEIL compiler
****************************************************************************
*/
#define Sfr(x, y)
sfr x = y
#define Sbit(x, y, z)
#define Sfr16(x,y)
sbit x = y^z
sfr16 x = y
/*----------------------------------------*/
/* Include file for 8051 SFR Definitions
*/
/*----------------------------------------*/
/*
BYTE Register
*/
Sfr (P0 , 0x80);
Sbit (P0_7 , 0x80, 7);
Sbit (P0_6 , 0x80, 6);
Sbit (P0_5 , 0x80, 5);
Sbit (P0_4 , 0x80, 4);
Sbit (P0_3 , 0x80, 3);
Sbit (P0_2 , 0x80, 2);
Sbit (P0_1 , 0x80, 1);
Sbit (P0_0 , 0x80, 0);
Sfr (P1 , 0x90);
Sbit (P1_7 , 0x90, 7);
Sbit (P1_6 , 0x90, 6);
Sbit (P1_5 , 0x90, 5);
Sbit (P1_4 , 0x90, 4);
Sbit (P1_3 , 0x90, 3);
Sbit (P1_2 , 0x90, 2);
Sbit (P1_1 , 0x90, 1);
Sbit (P1_0 , 0x90, 0);
Sfr (P2 , 0xA0);
Sbit (P2_7 , 0xA0, 7);
Sbit (P2_6 , 0xA0, 6);
Sbit (P2_5 , 0xA0, 5);
Sbit (P2_4 , 0xA0, 4);
Sbit (P2_3 , 0xA0, 3);
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4362A–80C51–07/04
Sbit (P2_2 , 0xA0, 2);
Sbit (P2_1 , 0xA0, 1);
Sbit (P2_0 , 0xA0, 0);
Sfr (P3 , 0xB0);
Sbit (P3_7 , 0xB0, 7);
Sbit (P3_6 , 0xB0, 6);
Sbit (P3_5 , 0xB0, 5);
Sbit (P3_4 , 0xB0, 4);
Sbit (P3_3 , 0xB0, 3);
Sbit (P3_2 , 0xB0, 2);
Sbit (P3_1 , 0xB0, 1);
Sbit (P3_0 , 0xB0, 0);
Sbit (RD , 0xB0, 7);
Sbit (WR , 0xB0, 6);
Sbit (T1 , 0xB0, 5);
Sbit (T0 , 0xB0, 4);
Sbit (INT1 , 0xB0, 3);
Sbit (INT0 , 0xB0, 2);
Sbit (TXD , 0xB0, 1);
Sbit (RXD , 0xB0, 0);
Sfr (P4 , 0xC0);
Sbit (P4_7 , 0xC0, 7);
Sbit (P4_6 , 0xC0, 6);
Sbit (P4_5 , 0xC0, 5);
Sbit (P4_4 , 0xC0, 4);
Sbit (P4_3 , 0xC0, 3);
Sbit (P4_2 , 0xC0, 2);
Sbit (P4_1 , 0xC0, 1);
Sbit (P4_0 , 0xC0, 0);
Sfr (P5 , 0xE8);
Sbit (P5_7 , 0xE8, 7);
Sbit (P5_6 , 0xE8, 6);
Sbit (P5_5 , 0xE8, 5);
Sbit (P5_4 , 0xE8, 4);
Sbit (P5_3 , 0xE8, 3);
Sbit (P5_2 , 0xE8, 2);
Sbit (P5_1 , 0xE8, 1);
Sbit (P5_0 , 0xE8, 0);
Sfr (PSW , 0xD0);
Sbit (CY
, 0xD0
, 7);
Sbit (AC
, 0xD0
, 6);
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4362A–80C51–07/04
Sbit (F0
, 0xD0
, 5);
Sbit (RS1 , 0xD0
, 4);
Sbit (RS0 , 0xD0
, 3);
Sbit (OV
, 0xD0
, 2);
Sbit (UD
, 0xD0
, 1);
Sbit (P
, 0xD0
, 0);
Sfr (ACC , 0xE0);
Sfr (B , 0xF0);
Sfr (SP , 0x81);
Sfr (DPL , 0x82);
Sfr (DPH , 0x83);
Sfr (PCON , 0x87);
Sfr (CKCON0 , 0x8F);
Sfr (CKCON1 , 0xAF);
/*------------------ TIMERS registers ---------------------*/
Sfr (TCON , 0x88);
Sbit (TF1 , 0x88, 7);
Sbit (TR1 , 0x88, 6);
Sbit (TF0 , 0x88, 5);
Sbit (TR0 , 0x88, 4);
Sbit (IE1 , 0x88, 3);
Sbit (IT1 , 0x88, 2);
Sbit (IE0 , 0x88, 1);
Sbit (IT0 , 0x88, 0);
Sfr (TMOD , 0x89);
Sfr
(T2CON , 0xC8);
Sbit (TF2
, 0xC8, 7);
Sbit (EXF2
, 0xC8, 6);
Sbit (RCLK
, 0xC8, 5);
Sbit (TCLK
, 0xC8, 4);
Sbit (EXEN2 , 0xC8, 3);
Sbit (TR2
, 0xC8, 2);
Sbit (C_T2
, 0xC8, 1);
Sbit (CP_RL2, 0xC8, 0);
Sfr (T2MOD , 0xC9);
Sfr (TL0 , 0x8A);
Sfr (TL1 , 0x8B);
Sfr (TL2 , 0xCC);
Sfr (TH0 , 0x8C);
Sfr (TH1 , 0x8D);
Sfr (TH2 , 0xCD);
Sfr (RCAP2L , 0xCA);
Sfr (RCAP2H , 0xCB);
Sfr (WDTRST , 0xA6);
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4362A–80C51–07/04
Sfr (WDTPRG , 0xA7);
/*------------------- UART registers ------------------------*/
Sfr (SCON , 0x98);
Sbit (SM0
, 0x98, 7);
Sbit (FE
, 0x98, 7);
Sbit (SM1
, 0x98, 6);
Sbit (SM2
, 0x98, 5);
Sbit (REN
, 0x98, 4);
Sbit (TB8
, 0x98, 3);
Sbit (RB8
, 0x98, 2);
Sbit (TI
, 0x98, 1);
Sbit (RI
, 0x98, 0);
Sfr (SBUF , 0x99);
Sfr (SADEN , 0xB9);
Sfr (SADDR , 0xA9);
/*-------------------- Internal Baud Rate Generator --------*/
Sfr (BRL
, 0x9A);
Sfr (BDRCON , 0x9B);
/*-------------------- IT registers -----------------------*/
Sfr (IEN0
, 0xA8);
Sfr (IEN1
, 0xB1);
Sfr (IPH0 , 0xB7);
Sfr (IPH1 , 0xB3);
Sfr (IPL0 , 0xB8);
Sfr (IPL1 , 0xB2);
/*
IEN0
*/
Sbit (EA
, 0xA8, 7);
Sbit (EC
, 0xA8, 6);
Sbit (ET2
, 0xA8, 5);
Sbit (ES
, 0xA8, 4);
Sbit (ET1
, 0xA8, 3);
Sbit (EX1
, 0xA8, 2);
Sbit (ET0
, 0xA8, 1);
Sbit (EX0
, 0xA8, 0);
/*--------------------- PCA registers -----------------------------*/
Sfr (CCON , 0xD8);
Sfr (CMOD , 0xD9);
Sfr (CH , 0xF9);
10
4362A–80C51–07/04
Sfr (CL , 0xE9);
Sfr (CCAP0H
, 0xFA);
Sfr (CCAP0L
, 0xEA);
Sfr (CCAPM0
, 0xDA);
Sfr (CCAP1H
, 0xFB);
Sfr (CCAP1L
, 0xEB);
Sfr (CCAPM1
, 0xDB);
Sfr (CCAP2H
, 0xFC);
Sfr (CCAP2L
, 0xEC);
Sfr (CCAPM2
, 0xDC);
Sfr (CCAP3H
, 0xFD);
Sfr (CCAP3L
, 0xED);
Sfr (CCAPM3
, 0xDD);
Sfr (CCAP4H
, 0xFE);
Sfr (CCAP4L
, 0xEE);
Sfr (CCAPM4
, 0xDE);
/* CCON */
Sbit (CF
, 0xD8, 7);
Sbit (CR
, 0xD8, 6);
Sbit (CCF4
, 0xD8, 4);
Sbit (CCF3
, 0xD8, 3);
Sbit (CCF2
, 0xD8, 2);
Sbit (CCF1
, 0xD8, 1);
Sbit (CCF0
, 0xD8, 0);
/*------------------ T W I registers ------------------------------*/
Sfr ( SSCON , 0x93);
Sfr ( SSCS , 0x94);
Sfr ( SSDAT , 0x95);
Sfr ( SSADR , 0x96);
Sfr ( PI2, 0xF8);
Sbit (PI2_1
, 0xF8, 1);
Sbit (PI2_0
, 0xF8, 0);
/*-------------------- OSC control registers ----------------------*/
Sfr ( CKSEL , 0x85 );
Sfr ( OSCCON , 0x86 );
Sfr ( CKRL , 0x97 );
/*-------------------- Keyboard control registers -----------------*/
Sfr ( KBLS , 0x9C );
Sfr ( KBE , 0x9D );
Sfr ( KBF , 0x9E );
/*-------------------- SPI ---------------------- -----------------*/
Sfr ( SPCON, 0xC3 );
Sfr ( SPSTA, 0xC4 );
Sfr ( SPDAT, 0xC5 );
11
4362A–80C51–07/04
/*------ Misc ----------------------------------------------------*/
Sfr( AUXR , 0x8E);
Sfr ( AUXR1, 0xA2);
Sfr ( FCON, 0xD1);
/*------ E data --------------------------------------------------*/
Sfr ( EECON,
0xD2 );
12
4362A–80C51–07/04
3. Assembler 51 Examples
3.1 Watchdog
$INCLUDE
(reg_c51.INC)
org 000h
ljmp begin
;/**
; * FUNCTION_PURPOSE:this function setup Watchdog.
; * FUNCTION_INPUTS:void
; * FUNCTION_OUTPUTS:void
; */
org 0100h
begin:
;Selected Time-out
;
;mode X1 12 clock periods per peripheral clock cycle.
;mode X2
6 clock periods per peripheral clock cycle.
;
;ORL WDTPRG,#00h
(2^14 - 1) machine cycles, 16. 3 ms @ FOSCA =12 MHz
;ORL WDTPRG,#01h
(2^15 - 1) machine cycles, 32.7 ms @ FOSCA=12 MHz
;ORL WDTPRG,#02h
(2^16 - 1) machine cycles, 65. 5 ms @ FOSCA=12 MHz
;ORL WDTPRG,#03h
(2^17 - 1) machine cycles, 131 ms @ FOSCA=12 MHz
;ORL WDTPRG,#04h
(2^18 - 1) machine cycles, 262 ms @ FOSCA=12 MHz
;ORL WDTPRG,#05h
(2^19 - 1) machine cycles, 542 ms @ FOSCA=12 MHz
;ORL WDTPRG,#06h
(2^20 - 1) machine cycles, 1.05 s @ FOSCA=12 MHz
;ORL WDTPRG,#07h
(2^21 - 1) machine cycles, 2.09 s @ FOSCA=12 MHz
ORL WDTPRG,#07;/*2.275s @ FOSCA=11.059200 MHz */
;/* watchdog start sequence */
MOV WDTRST,#1Eh;
MOV WDTRST,#0E1h;
loop:
/* end less */
;/***********************************************
;*
PROGRAM
*
;************************************************/
;
/* watchdog reset sequence */
MOV WDTRST,#1Eh;
MOV WDTRST,#0E1h;
JMP loop
END
13
4362A–80C51–07/04
3.2 Keyboard
$INCLUDE
(reg_c51.INC)
;/*_____ D E C L A R A T I O N ___________________________________________*/
keypressed DATA 10H;
/* key pressed value */
key_flag BIT 20H;
/* software flag */
org 000h
ljmp begin
org 3Bh
ljmp keyboard_it
;/**
; * FUNCTION_PURPOSE:this function setup keyboard.
; * A key set idle mode and an other set the power-down mode
; * In this two mode the microcontoleur wake up at keyboard event
; * FUNCTION_INPUTS:void
; * FUNCTION_OUTPUTS:void
; */
org 0100h
begin:
SETB EA;
/* enable interrupts */
;/* init keyboard */
MOV
KBE,#0FFh;
/*Enable all P1 I/O as keyboard IO */
MOV
KBF,#00;
/* Clear all keyboard flags */
ORL
IEN1,#01h;
/* Enable keyboard interupt */
loop:
JNB key_flag,end_if_key_flag
/* keyboard occur */
MOV R7, keypressed;
CJNE R7,#10h,end_if_key0x10;
;
/*enter Idle mode */
/* Entering Idle Mode */
ORL PCON,#01h;
;
/* Wake up by keypressed value */
end_if_key0x10:
CJNE R7,#20h,end_if_key0x20;
;
/* enter powerdown mode */
/* Entering PowerDown Mode */
ORL PCON,#02h;
;
/* Wake up by keypressed value */
end_if_key0x20:
CLR key_flag;
/* reset softaware flag */
end_if_key_flag:
JMP loop
14
4362A–80C51–07/04
;/**
;* FUNCTION_PURPOSE:keyboard_interrupt. Save pressed key
;* FUNCTION_INPUTS:void
;* FUNCTION_OUTPUTS:void
;*/
keyboard_it:
MOV keypressed,KBF;
/* save pressed key */
SETB key_flag;
/* set the software flag */
MOV KBF,#00h;
/* clear keyboard flags */
RETI
end
15
4362A–80C51–07/04
3.3 SFR Register Definition
$SAVE
$NOLIST
P0
DATA
80H
TCONDATA88H
;---
TCON Bits ---
TF1
BIT
8FH
TR1
BIT
8EH
TF0
BIT
8DH
TR0
BIT
8CH
IE1
BIT
8BH
IT1
BIT
8AH
IE0
BIT
89H
IT0
BIT
88H
P1
DATA
90H
SCON
DATA
98H
;--- SCON Bits ---SM0
BIT
9FH
SM1
BIT
9EH
SM2
BIT
9DH
REN
BIT
9CH
TB8
BIT
9BH
RB8
BIT
9AH
TI
BIT
99H
RI
BIT
98H
P2
DATA
0A0H
IEN0
DATA
0A8H
;--- IEN0 Bits ----EA
BIT0AFH
EC
BIT0AEH
ET2
BIT0ADH
ES
BIT0ACH
ET1 BIT0ABH
EX1
BIT0AAH
ET0 BIT0A9H
EX0BIT0A8H
P3
DATA
0B0H
;--- P3 Bits ------RD
BIT
0B7H
WR
BIT
0B6H
T1
BIT
0B5H
T0
BIT
0B4H
INT1
BIT
0B3H
16
4362A–80C51–07/04
INT0
BIT
0B2H
TXD
BIT
0B1H
RXD
BIT
0B0H
P4
DATA
0C0H
P5
DATA
0E8H
IPL0DATA0B8H
;--- IPL0 Bits ----PPCL
BIT0BEH
PT2L
PSL
BIT0BDH
BIT0BCH
PT1L BIT0BBH
PX1L
BIT0BAH
PT0L BIT0B9H
PX0LBIT0B8H
T2CON
DATA
0C8H
;--- T2CON bits ---TF2
BIT
0CFH
EXF2
BIT
0CEH
RCLK
BIT
0CDH
TCLK
BIT
0CCH
EXEN2
BIT
0CBH
TR2
BIT
0CAH
C_T2
BIT
0C9H
CP_RL2
BIT
0C8H
PSW
DATA
0D0H
;--- PSW bits -----CY
BIT
0D7H
AC
BIT
0D6H
F0
BIT
0D5H
RS1
BIT
0D4H
RS0
BIT
0D3H
OV
BIT
0D2H
P
BIT
0D0H
CCONDATA0D8H
;--- CCON bits ----CF
BIT
0DFH
CR
BIT
0DEH
CCF4
BIT
0DCH
CCF3
BIT
0DBH
CCF2
BIT
0DAH
CCF1
BIT
0D9H
CCF0
BIT
0D8H
ACC
DATA
0E0H
17
4362A–80C51–07/04
B
DATA
0F0H
SP
DATA
81H
DPL
DATA
82H
DPH
DATA
83H
PCON
DATA
87H
TMOD
DATA
89H
TL0
DATA
8AH
TL1
DATA
8BH
TH0
DATA
8CH
TH1
DATA
8DH
AUXRDATA08EH
CKCON0DATA08Fh
SBUF
DATA
99H
;-- Baud Rate generator
BRL
DATA09AH
BDRCON
DATA 09BH
;--- Keyboard
KBLSDATA09CH
KBEDATA09DH
KBFDATA09EH
;--- Watchdog timer
WDTRSTDATA0A6H
WDTPRG DATA0A7H
SADDRDATA0A9H
CKCON1DATA0AFH
IEN1DATA0B1H
IPL1DATA0B2H
IPH1DATA0B3H
IPH0DATA0B7H
SADENDATA0B9H
T2MODDATA
0C9h
RCAP2L
DATA
0CAH
RCAP2H
DATA
0CBH
TL2
DATA
0CCH
TH2
DATA
0CDH
CMODDATA0D9H
18
4362A–80C51–07/04
CCAPM0DATA0DAH
CCAPM1DATA0DBH
CCAPM2DATA0DCH
CCAPM3DATA0DDH
CCAPM4DATA0DEH
CHDATA0F9H
CCAP0HDATA0FAH
CCAP1HDATA0FBH
CCAP2HDATA0FCH
CCAP3HDATA0FDH
CCAP4HDATA0FEH
CLDATA0E9H
CCAP0LDATA0EAH
CCAP1LDATA0EBH
CCAP2LDATA0ECH
CCAP3LDATA0EDH
CCAP4LDATA0EEH
; SPI
SPCON
DATA
0C3H
SPSTA
DATA
0C4H
SPDAT
DATA
0C5H
; TWI
PI2DATA
0F8h
SSCONDATA093H
SSCSDATA094H
SSDATDATA095H
SSADRDATA096H
PI2_OBIT0F8H
PI2_1BIT0F9H
; Clock Control
OSCCONDATA086H
CKSELDATA085H
CKRLDATA097H
;MISC
AUXR1DATA0A2H
; Flash control
FCON
DATA
0D1H
;EEData
EECONDATA0D2H
$RESTORE
19
4362A–80C51–07/04
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