Nuvoton NuMicro MS51PC0AE - Page 260

MS51
Nov. 28, 2019 Page 260 of 491 Rev 1.00
MS51 32K SERIES TECHNICAL REFERENCE MANUAL
CLR A
MOVC A,@A+DPTR ;Read content of address 201h
MOV P0,A
SJMP $
C language demo code:
//*************************************************************************
*****
// This code illustrates how to use IAP to make APROM 201h as a
byte of
// Data Flash when user code is executed in APROM.
//*************************************************************************
*****
#define PAGE_ERASE_AP 0x22
#define BYTE_PROGRAM_AP 0x21
/*Data Flash, as part of APROM, is read by MOVC. Data Flash can be defined
as
128-element array in “code” area from absolute address 0x0200
*/
volatile unsigned char code Data_Flash[128] _at_ 0x0200;
Main (void)
{
TA = 0Xaa; //CHPCON is TA protected
TA = 0x55;
CHPCON |= 0x01; //IAPEN = 1, enable IAP mode
TA = 0Xaa; //IAPUEN is TA protected
TA = 0x55;
IAPUEN |= 0x01; //APUEN = 1, enable APROM update
IAPCN = PAGE_ERASE_AP; //Erase page 200h~27Fh
IAPAH = 0x02;
IAPAL = 0x00;
IAPFD = 0Xff;
TA = 0Xaa; //IAPTRG is TA protected
TA = 0x55;
IAPTRG |= 0x01; //write ‘1’ to IAPGO to trigger IAP
process
IAPCN = BYTE_PROGRAM_AP; // Program 201h with 55h
IAPAH = 0x02;
IAPAL = 0x01;
IAPFD = 0x55;
TA = 0Xaa;
TA = 0x55;
IAPTRG |= 0x01; //write ‘1’ to IAPGO to trigger IAP
process
TA = 0Xaa; //IAPUEN is TA protected