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Re: [avr-gcc-list] a question about atmega128 io port
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From: |
Christof Krueger |
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Subject: |
Re: [avr-gcc-list] a question about atmega128 io port |
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Date: |
Thu, 24 Mar 2005 12:32:04 +0100 |
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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