STC micro STC8A8K64D4 Series - Page 73

STC8A8K64D4 Series Manual
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P3M0 = 0x00;
P3M1 = 0x00;
P4M0 = 0x00;
P4M1 = 0x00;
P5M0 = 0x00;
P5M1 = 0x00;
P_SW2 = 0x80;
CKSEL = 0x00; // Select internal IRC (default)
CLKDIV = 0x08; // Clock divided by 8
P_SW2 = 0x00;
IRTRIM++; // Fine-tune the IRC frequency up 3 ‰ (pay attention to judging the boundary)
// IRTRIM--; // Fine-tune the IRC frequency down 3 ‰ (pay attention to judging the boundary)
while (1);
}
Assembly code
; Operating frequency for test is 24MHz
P_SW2 DATA 0BAH
IRTRIM DATA 09FH
CKSEL EQU 0FE00H
CLKDIV EQU 0FE01H
HIRCCR EQU 0FE02H
XOSCCR EQU 0FE03H
IRC32KCR EQU 0FE04H
P0M1 DATA 093H
P0M0 DATA 094H
P1M1 DATA 091H
P1M0 DATA 092H
P2M1 DATA 095H
P2M0 DATA 096H
P3M1 DATA 0B1H
P3M0 DATA 0B2H
P4M1 DATA 0B3H
P4M0 DATA 0B4H
P5M1 DATA 0C9H
P5M0 DATA 0CAH
ORG 0000H
LJMP MAIN
ORG 0100H
MAIN:
MOV SP, #5FH
MOV P0M0, #00H
MOV P0M1, #00H
MOV P1M0, #00H
MOV P1M1, #00H
MOV P2M0, #00H
MOV P2M1, #00H
MOV P3M0, #00H
MOV P3M1, #00H
MOV P4M0, #00H
MOV P4M1, #00H
MOV P5M0, #00H