开发板模块Pocket AVR Programmer PGM-09825

　　开发板模块Pocket AVR Programmer PGM-09825

　　? USB Connector – This is your data and power input to the

　　Programmer. A mini-B USB cable plugs in here and connects your

　　puter to the Programmer.

　　? 2x5 ISP Header – This shrouded header mates with the included

　　Programming Cable, and allows you to send the programming

　　signals out to your AVR. It’s polarized to make sure you can’t plug

　　anything in backwards.

　　? Power Target Switch – Unlike a lot of ISP’s out there, the AVR

　　Pocket Programmer can deliver power to the AVR-to-be

　　programmed. Flick this switch to the “Power Target” side, to send 5V

　　to the AVR. More on this below.

　　? ATtiny2313 – This is the chip that works the programming magic. It

　　converts between USB and SPI to turn mands from your

　　puter into words and instructions to load into your AVR-to-be

　　programmed. Unless you want to customize the Tiny ISP firmware,

　　you can leave this chip alone.

　　? The unpopulated ISP header, above the ATtiny2313, is broken

　　out in case that chip needs to be programmed. It’s mostly used

　　in production by those who program the programmers.

　　? 74AC125 Buffer – This chip helps to add some protection to the

　　programmer by buffering the data-line outputs. Another IC to mostly

　　ignore.

　　The board also includes a variety of LEDs to indicate power, status, and

　　data transfers.

　　AVR ISP Pinouts

　　AVRs are programmed through an SPI interface. There are six unique

　　signals required for munication between ISP and AVR: VCC, GND,

　　Reset, MOSI, MISO, and SCK.

　　To route those signals between devices, there are two standardized

　　connectors – one 6-pin, 2x3 connector and another 10-pin, 2x5:

　　AVR ISP pinouts – top view.

　　The AVR Pocket Programmer includes an on-board 2x5 connector, and the

　　included AVR Programming Cable terminates with both 2x5 and 2x3

　　connectors.

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