3M Four Wall Header

Created By: Hussein Nosair

3M 10 pins Header:

3M 16 pins Header:

HC12 Microcontroller :: Assembly vs. C syntax

Created By: Hussein Nosair

Source: EE308 @ New Mexico Tech

Comparison of basic assembly language and C syntax

Assembly                      |   C
------------------------------|------------------------------------
; Use a name instead of a num |   /* Use a name instead of a num */
COUNT:  EQU  5                |   #define COUNT 5
;-----------------------------|   /*-----------------------------*/
;start a program              |   /* To start a program */
CODE:  section  .text         |   main()
       org   $0800            |   {
       lds   #$0A00           |   }
;-----------------------------|   /*-----------------------------*/
;allocate two bytes for       |   /* Allocate two bytes for 
;a signed number              |    * a signed number */
                              |
DATA: section .data           |
      org     $0900           |
i:    ds.w    1               |   int i;
j:    dc.w    $1A00           |   int j = 0x1a00;
;-----------------------------|   /*-----------------------------*/
;allocate two bytes for       |   /* Allocate two bytes for 
;an unsigned number           |    * an unsigned number */
i:    ds.w    1               |   unsigned int i;
j     dc.w    $1A00           |   unsigned int j = 0x1a00;
;-----------------------------|   /*-----------------------------*/
;allocate one byte for        |   /* Allocate one byte for 
;an signed number             |    * an signed number */
                              |
i:    ds.b    1               |   signed char i;
j:    dc.b    $1F             |   signed char j = 0x1f;
;-----------------------------|   /*-----------------------------*/
;Get a value from an address  |   /* Get a value from an address */
                              |
i:  ds.b   1                  |   unsigned char i;
                              |
    ldx    $E000              |   i = *(unsigned char *) 0xE000;
    ldaa   0,x                |  
    staa   i                  |
;-----------------------------|   /*-----------------------------*/
; Use a variable to store     |   /* Use a variable as a pointer
; an address                  |      (address) */
                              |  
i:   ds.b  1                  |   unsigned char *ptr, i;  
ptr: ds.b  1                  |  
                              |  
     ldd   #$E000             |   ptr = (unsigned char *) 0xE000;
     std   ptr                |   
     ldx   ptr                |   i = *ptr;  
     ldaa  0,x                |  
     staa  i                  |   
     ldx   ptr                |   *ptr = 0x55;
     ldaa  #$55               |  
     staa  0,x                |   
;-----------------------------|   /*-----------------------------*/
;To call a subroutine         |   /* To call a function */
  ldaa  i                     |   sqrt(i);
  jsr   sqrt                  |
;-----------------------------|   /*-----------------------------*/
;To return from a subroutine  |   /* To return from a function */
  ldaa  j                     |   return j;
  rts                         |

;-----------------------------|   /*-----------------------------*/
;Flow control                 |   /* Flow control */
    blo                       |   if (i < j)
    blt                       |   if (i < j)
                              |
    bhs                       |   if (i >= j)
    bge                       |   if (i >= j)
                              |

PC/104 Connector Pin Assignment and Layout

Created by:Hussein Nosair

Row B		Row A		Row C		Row D
Pin No.	Signal	Pin No.	Signal	Pin No.	Signal	Pin No.	Signal
1	GND	33	IOCHCK	65	GND	85	GND
2	RSTDRV	34	D7	66	SBHE	86	MEMCS16
3	+5V	35	D6	67	LA23	87	IOCS16
4	IRQ9	36	D5	68	LA22	88	IRQ
5	-5V	37	D4	69	LA21	89	IRQ
6	DRQ2	38	D3	70	LA20	90	IRQ
7	-12V	39	D2	71	LA19	91	IRQ
8	ENDXFER	40	D1	72	LA18	92	IRQ
9	+12V	41	D0	73	LA17	93	DACK
10	KEY	42	IOCHRDY	74	MEMR	94	DRQ
11	SMEMW	43	AEN	75	MEMW	95	DACK
12	SMEMR	44	A19	76	SD8	96	DRQ
13	IOW	45	A18	77	SD9	97	DACK
14	IOR	46	A17	78	SD10	98	DRQ
15	DACK3	47	A16	79	SD11	99	DACK
16	DRQ3	48	A15	80	SD12	100	DRQ
17	DACK1	49	A14	81	SD13	101	+5V
18	DRQ1	50	A13	82	SD14	102	MASTER
19	REFRESH	51	A12	83	SD15	103	GND
20	SYSCLK	52	A11	84	GND	104	GND
21	IRQ7	53	A10
22	IRQ6	54	A9
23	IRQ5	55	A8
24	IRQ4	56	A7
25	IRQ3	57	A6
26	DACK2	58	A5
27	TC	59	A4
28	BALE	60	A3
29	+5V	61	A2
30	OSC	62	A10
31	GND	63	A0
32	GND	64	GND