rw_eeprom.s

来自「详细介绍Ｍ８两版间通讯」· S 代码 · 共 74 行

	.module RW_eeprom.c
	.area text(rom, con, rel)
	.dbfile G:\Mega8程序\测试MegaOSCCAL\RW_eeprom.c
	.dbfunc e rom_write _rom_write fV
;           Data -> R18
;        Address -> R16,R17
	.even
_rom_write::
	.dbline -1
	.dbline 3
; #include <iom8v.h>
; void rom_write(unsigned int Address,unsigned  char Data)
; 	 {
L2:
	.dbline 4
L3:
	.dbline 4
; 	  while(EECR&(1<<EEWE));
	sbic 0x1c,1
	rjmp L2
	.dbline 5
; 	  EEAR=Address;
	out 0x1f,R17
	out 0x1e,R16
	.dbline 6
; 	  EEDR=Data;
	out 0x1d,R18
	.dbline 7
; 	  EECR|=(1<<EEMWE);
	sbi 0x1c,2
	.dbline 8
; 	  EECR|=(1<<EEWE);
	sbi 0x1c,1
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbsym r Data 18 c
	.dbsym r Address 16 i
	.dbend
	.dbfunc e rom_read _rom_read fi
;        Address -> R16,R17
	.even
_rom_read::
	.dbline -1
	.dbline 11
; 	  }
; unsigned rom_read(unsigned int Address)
; 		  {
L6:
	.dbline 12
L7:
	.dbline 12
; 		   while(EECR&(1<<EEWE));
	sbic 0x1c,1
	rjmp L6
	.dbline 13
; 		   EEAR=Address;
	out 0x1f,R17
	out 0x1e,R16
	.dbline 14
; 		   EECR|=(1<<EERE);
	sbi 0x1c,0
	.dbline 15
; 		   return EEDR;
	in R16,0x1d
	clr R17
	.dbline -2
L5:
	.dbline 0 ; func end
	ret
	.dbsym r Address 16 i
	.dbend