Tutorial
Microcontroller 8051 |
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Simple Power Supply and Charger Circuits Figure 4 shows a simple power supply circuit. I have tested with KABO, it works fine. For those who have a big capacity rechargeable battery, the resistance value of R can be selected for approx. 10% output charging current. DC in can be higher if your battery voltage higher than 8.4V, say. To ensure the output current is within the value calculated by R, measure DC current before. The maximum supply for LM317 is ~35V.
/* C52ADC.C 4-channel 8-bit resolution ADC and 6-bit input port for C52-EVB Copyright 2000 Wichit Sirichote start conversion by high to low signal at RB0, 40-bit data is then shifted out through PA4 with low-to-high trnasition at RB0 The format is started from ADC0,ADC1,ADC2,ADC3,port_B ~60uS LSB after high-to-low starting 711 chip to read analog input and port B, at least 60 microseconds required before low-to-high data shifted out to begin. */ #include <C52ADC.H>
#fuses RC,NOPROTECT,NOWDT,PUT,BROWNOUT
byte buffer[5]; read_analog()
{
byte i;
for(i = 0; i < 4; i++)
{
set_adc_channel(i);
delay_us(5);
buffer[i] = read_adc();
}
} read_portB()
{
buffer[4] = port_B;
}
send_data_out()
{
byte i;
for(i=0;i<40;++i){ // 5 bytes
while (!input(PIN_B0));
output_bit(PIN_A4,shift_right(buffer,5,0));
while (input(PIN_B0));} // shifted out when RB0 change from LOW to HIGH
}
/*This shifts 40 bits out Pin_A4, LSB first.*//*This shifts 40 bits
out Pin_A4, LSB first.*/
// ___---___---___---___---____
// LSB ......................... MSB
main() {
port_b_pullups(TRUE);
setup_counters(RTCC_INTERNAL,RTCC_DIV_2);
setup_port_a(ALL_ANALOG);
setup_adc(ADC_CLOCK_INTERNAL);
while(1){
while(input(PIN_B0));//wait High to Low trigger read signal from C-52EVB
read_analog();
read_portB();
send_data_out(); // send 40 bits in buffer array to PIN_A4
}
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Lesson 1: Lesson 2: |
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