MacAphon / it_help

AT89S8252

Interrupts:

interrupt	asm addr.	c
ext0:	0003h	0
timer0:	000Bh	1
ext1:	0013h	2
timer1:	001Bh	3
serial:	0023h	4
timer2:	002Bh	5

Assembler:

$NOMOD51
$include (AT898252.h)
org 0000h
LJMP start

; vvvv Interrupt sprungbefehle
org 0003h
LJMP int0_isr

; vvvv Main Program
start:
; ...

; vvvv Interrupt Service Routines
int0_isr:
    ; ...
    RETI

; Programmende
END

Ports: P2.3
Konstanten: #0A1h entspr. 0xA1
#1d entspr. 0d1 Kommentare: ; Kommentar

C:

vollständige Dokumentation für Cx51 hier.

#include<AT898252.h>

// data type aliases for convenience, can be ignored
#define u8  unsigned char
#define i8  char
#define u16 unsigned int
#define i16 int
#define u32 unsigned long int
#define i32 long int

// vvvv Function Prototypes, required for Cx51
void init();
void int0();

void main() {
    init();
    // ...
}

// vvvv Setup the interrupts
void init() {
    IT0 = 1; // falling edge triggered
             // state triggered: 0
    EX0 = 1; // Enable EXT0
    EA  = 1; // Enable Interrupts
}

// vvvv Interrupt Service Routine
void int0() interrupt 0 {
    // ...
}

Ports: P2_3
Kommentare:

// Kommentar
/*
  Kommentar
 */

Arrays:

int x[5];
int y[3] = {3, 4, 5}
int z[] = {3, 4, 5};  // Größe implizit
char r[13] = "Hello, World!"  // char-arrays als Strings

memory types:

type	ort
data	direkt adressierbarer interner unterer RAM
bdata	bitwise adressierbarer interner unterer RAM
idata	indirekt adressierbarer interner oberer RAM
pdata	'paged' externer Datenspeicher
xdata	externer Datenspeicher
code	Programmspeicher

Nutzung:

unsigned int data x = 3;
char idata y = "a";

standard c data types:

type	description
unsigned char	8-bit unsigned integer
char	8-bit signed integer, zusätzlich ASCII character
unsigned int	16-bit unsigned integer, equivalent zu unsigned short int
int	16-bit signed integer, equivalent zu short int
unsigned long int	32-bit unsigned integer
long int	32-bit signed integer
float	32-bit floating-point, equivalent zu double

special data types:

type	size
sbit	1 Bit
sfr	1 Byte
sfr 16	2 Byte

Anderes Hilfreiches:

∧ : AND
∨ : OR
¬ : NOT

b	x	d	o
0000	0	0	0
0001	1	1	1
0010	2	2	2
0011	3	3	3
0100	4	4	4
0101	5	5	5
0110	6	6	6
0111	7	7	7
1000	8	8	10
1001	9	9	11
1010	A	10	12
1011	B	11	13
1100	C	12	14
1101	D	13	15
1110	E	14	16
1111	F	15	17