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Re: [avr-gcc-list] a question about atmega128 io port

From: Christof Krueger
Subject: Re: [avr-gcc-list] a question about atmega128 io port
Date: Thu, 24 Mar 2005 12:32:04 +0100
User-agent: Mozilla Thunderbird 1.0 (X11/20050116)

>       Hi all,in the page 64 of the datasheet of atmega128,there's a general
> digital I/O functional figure,i don't understand what is
> RPx、WPx、WDx、RDx in the figure,can anyone
> give me some explains?
>       Thanks

It's explained below the figure:

WDx: Write DDRx
RDx: Read DDRx
WPx: Write PORTx
RRx: Read PORTx Register
RPx: Read PORTX Pin

These signals are generated somewhere in the microcontroller if you
access (read/write) the corresponding io registers. So if you write
out PORTB, 0xff
this command will be decoded and the write strobe WPx will be generated
for every pin of PORTB.

Christof Krueger

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