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thank you all for your replies, may i ask what is the problem with my code if this is happening?
this is my code
char buff=0; // usart data are char, not float
PORTB = 0x00;
TRISB = 0x00;
TRISC = 0xBF; // only TX pin is made output on port C
plus this is what my zigbee schematics look like the pin headers are connected to rx and tx of my PIC. Initially without the xbee, the Vcc reading is 3.33 volts. When i attach the xbee module it goes down to 3.0 volts, what can be the problem?
the vout of the regulator is 5V, the resistance values of each resistors are 4.7k. i took the voltage before R2 that gives me 3.3V. another thing, when i disconnect the connection at rx and tx between my pic and zigbee and with my zigbee attached to that circuit, it gives me a reading of 1.8V.