STC micro STC8A8K64D4 Series Reference Manual page 105

STC8A8K64D4 Series Manual
P0M0 = 0x00;
P0M1 = 0x00;
P1M0 = 0x00;
P1M1 = 0x00;
P2M0 = 0x00;
P2M1 = 0x00;
P3M0 = 0x00;
P3M1 = 0x00;
P4M0 = 0x00;
P4M1 = 0x00;
P5M0 = 0x00;
P5M1 = 0x00;
P_SW2 = 0x00;
// P_SW2 = 0x10;
// P_SW2 = 0x30;
P_SW2 |= 0x80;
I2CCFG = 0x80;
I2CSLCR = 0x40;
EA = 1;
PCON = 0x02;
routine after power-down wake-up
_nop_();
_nop_();
_nop_();
_nop_();
while (1)
{
P11 = ~P11;
}
}
Assembly code
; Operating frequency for test is 11.0592MHz
P_SW2 DATA
I2CCFG XDATA
I2CSLCR XDATA
I2CSLST XDATA
P0M1 DATA
P0M0 DATA
P1M1 DATA
P1M0 DATA
P2M1 DATA
P2M0 DATA
P3M1 DATA
P3M0 DATA
P4M1 DATA
P4M0 DATA
P5M1 DATA
P5M0 DATA
ORG
LJMP
ORG
LJMP
0BAH
0FE80H
0FE83H
0FE84H
093H
094H
091H
092H
095H
096H
0B1H
0B2H
0B3H
0B4H
0C9H
0CAH
0000H
MAIN
00C3H
I2CISR
//Wake up MCU on the falling edge of SDA/P1.4
//Wake up MCU on the falling edge of SDA_2/P2.4
//Wake up MCU on the falling edge of SDA_4/P3.3
//Enable slave mode of I2C module
//Enable start signal interrupt
//MCU enters power-down mode, it will not enter the interrupt service
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