STC micro STC8A8K64D4 Series - Example Routines; USART1 Switch

STC8A8K64D4 Series Manual
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3.2 Example Routines
3.2.1 USART1 switch
C language code
// Operating frequency for test is 11.0592MHz
#include “reg51.h”
sfr P_SW1 = 0xa2;
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 main()
{
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_SW1 = 0x00; //RXD/P3.0, TXD/P3.1
// P_SW1 = 0x40; //RXD_2/P3.6, TXD_2/P3.7
// P_SW1 = 0x80; //RXD_3/P1.6, TXD_3/P1.7
// P_SW1 = 0xc0; //RXD_4/P4.3, TXD_4/P4.4
while (1);
}
Assembly code
; Operating frequency for test is 11.0592MHz
P_SW1 DATA 0A2H
P0M1 DATA 093H
P0M0 DATA 094H
P1M1 DATA 091H
P1M0 DATA 092H
P2M1 DATA 095H
P2M0 DATA 096H
P3M1 DATA 0B1H