NXP Semiconductors P89LPC9321 UM10310 - Manual (Page 116)

UM10310 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2010. All rights reserved.
User manual Rev. 2 — 1 November 2010 116 of 139
NXP Semiconductors
UM10310
P89LPC9321 User manual
;* C = clear on no error, set on error *
;**************************************************
LOAD EQU 00H
EP EQU 68H
PGM_USER:
MOV FMCON,#LOAD ;load command, clears page register
MOV FMADRH,R4 ;get high address
MOV FMADRL,R5 ;get low address
MOV A,R7 ;
MOV R0,A ;get pointer into R0
LOAD_PAGE:
MOV FMDAT,@R0 ;write data to page register
INC R0 ;point to next byte
DJNZ R3,LOAD_PAGE ;do until count is zero
MOV FMCON,#EP ;else erase & program the page
MOV R7,FMCON ;copy status for return
MOV A,R7 ;read status
ANL A,#0FH ;save only four lower bits
JNZ BAD ;
CLR C ;clear error flag if good
RET ;and return
BAD:
SETB C ;set error flag
RET ;and return
A C-language routine to load the page register and perform an erase/program operation is
shown below.
#include
unsigned char idata dbytes[64]; // data buffer
unsigned char Fm_stat; // status result
bit PGM_USER (unsigned char, unsigned char);
bit prog_fail;
void main ()
{
prog_fail=PGM_USER(0x1F,0xC0);
}
bit PGM_USER (unsigned char page_hi, unsigned char page_lo)
{
#define LOAD 0x00 // clear page register, enable loading
#define EP 0x68 // erase & program page
unsigned char i; // loop count
FMCON = LOAD; //load command, clears page reg
FMADRH = page_hi; //
FMADRL = page_lo; //write my page address to addr regs
for (i=0;i<64;i=i+1)