STC micro STC8A8K64D4 Series - Wake up MCU from Power Saving Mode Using I2 C SDA Pin

STC8A8K64D4 Series Manual
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ORL IE2,#ES3 ;Enable UART3 interrupt
ORL IE2,#ES4 ;Enable UART4 interrupt
SETB EA
MOV PCON,#02H ;MCU enters power down mode
NOP ;It will not enter the interrupt service routine after wake-up from power down mode.
NOP
NOP
NOP
LOOP:
CPL P1.1
JMP LOOP
END
6.7.10 Wake up MCU from Power Saving Mode using I2C SDA pin
SCL
SDA
(output)
I2C STRT
MCU is woke up
at this time.
C language code
// Operating frequency for test is 11.0592MHz
#include "reg51.h"
#include "intrins.h"
sfr P_SW2 = 0xba;
#define I2CCFG (*(unsigned char volatile xdata *)0xfe80)
#define I2CSLCR (*(unsigned char volatile xdata *)0xfe83)
#define I2CSLST (*(unsigned char volatile xdata *)0xfe84)
sbit P11 = P1^1;
sfr P0M1 = 0x93;
sfr P0M0 = 0x94;
sfr P1M1 = 0x91;
sfr P1M0 = 0x92;
sfr P2M1 = 0x95;
sfr P2M0 = 0x96;
sfr P3M1 = 0xb1;
sfr P3M0 = 0xb2;
sfr P4M1 = 0xb3;
sfr P4M0 = 0xb4;
sfr P5M1 = 0xc9;
sfr P5M0 = 0xca;
void i2c_isr() interrupt 24
{
P_SW2 |= 0x80;
I2CSLST &= ~0x40;
}
void main()
{