Octagon 6000 Series, User Manual

Page: 136 / 233

17-3
6000 Series user’s manual Serial EEPROM
Read multiple words from the serial EEPROM
Function: fch
Subfunction: 02h
Purpose: To read multiple words from the on-board serial
EEPROM.
Calling registers: AH fch
AL 02h
BX Word address (zero based)
CX Word count
DX ffffh
ES:DI Destination pointer
Return registers: Carry flag cleared if successful
AX
Word read
Carry flag set if error
AL
Error code
Error Code Meaning
ffh Unknown error
01h Function not implemented
02h Defective serial EEPROM
03h Illegal access
Comments: This function reads multiple words from the user area of
the serial EEPROM.
Programming example:
/* Read 10 words starting at word 5 */
unsigned int far *seeDataPtr = new unsigned int[10];
/* Allocate storage*/
/* Inline assembly code for Borland C++ 3.1 */
asm {
mov ax,0fc02h
mov bx,05h /* Read starts at word 5 */
mov cx,10 /* Read 10 words */
mov dx,0ffffh
les di,seeDataPtr
int 17h
}
Write multiple words to the serial EEPROM
Function: fch
Subfunction: 03h
Purpose: To write multiple words to the on-board serial
EEPROM.