Arduino 828p Pro Mini

I bought this small board Arduino Mini (the right board, not the left board which is just a power regulator) from eBay from China for less than $2 plus S/H.  The bareboard has SMD version of Atmel AVR 828p, a RESET switch (left), and bunch of I/O ports.  The board seems a clone of what Sparkfun has (see https://www.sparkfun.com/products/11113)

Specifications:

• 20 Digital input / output ports:TX, RX, D2..D13, A0 .. A5
• 8 analog inputs ports:A0 ~ A7
• 1 pairs of TTL level serial transceiver ports RX / TX
• 6 PWM ports: D3, D5, D6, D9, D10, D11
• Main Chip: Atmel Atmega328P-AU
• Support Serial Download
• Support external power supply 3.8-12V DC
• Support 12V or less than 12V battery power supply
• 16MHz clock frequency
• Size: 33.8mm x 18mm
• Supports auto-reset
• Max 150mA output
• Over current protected
• Weighs less than 2 grams

When supplying unregulated power to the board, we should connect to the “RAW” pin and not VCC.
I/O pins are labeled "D0", "D1", ... "D13" for digital I/Os, and "A0" to "A7" for analog inputs.  There are two TRO and RXI pins.

Label on Board	Function(s)
A0	ADC0
A1	ADC1
A2	ADC2
A3	ADC3
A4	ADC4/SDA
A5	ADC5/SCL
A6	ADC6
A7	ADC7
RXI	D0/RXD
TXO	D1/TXD
D2	D2/INT0
D3	D3/INT1
D4	D4/T0
D5	D5
D6	D6/OC0B
D7	D7/IN1
D8	D8/ICP1
D9	D9/PCINT1
D10	D10/PCINT2
D11	D11/PCINT3
D12	D12/MISO
D13	D13/SCK/LED