User manual
BOARD LAYOUT:
POWER SUPPLY CIRCUIT:
MOD-USB-RS232 can take power from two sources:
5 VDC via pin holes VUSB and GND.
5 VDC via USB connector.
The programmed board power consumption is about 20 mA with all peripherals
enabled
RESET CIRCUIT:
MOD-USB-RS232 reset circuit includes R1 (4.7k), R11(240Ω/1%), D1
(BZV55C8V2), PIC18F14K50 pin 4 (RA3/MCLR/VPP).
CLOCK CIRCUIT:
Quartz crystal 12 MHz is connected to PIC18F14K50 pin 2
(RA5/OSC1/CLKIN) and pin 3 (RA4/AN3/OSC2/CLKOUT).
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