| 1 |
4 |
doru |
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
|
| 2 |
|
|
<html><head><meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
|
| 3 |
|
|
<title>General IO port</title>
|
| 4 |
|
|
<link href="doxygen.css" rel="stylesheet" type="text/css">
|
| 5 |
|
|
</head><body>
|
| 6 |
|
|
<!-- Generated by Doxygen 1.2.16 -->
|
| 7 |
|
|
<center>
|
| 8 |
|
|
<a class="qindex" href="main.html">Main Page</a> <a class="qindex" href="modules.html">Modules</a> <a class="qindex" href="pages.html">Related Pages</a> </center>
|
| 9 |
|
|
<hr><h1>General IO port<br>
|
| 10 |
|
|
<small>
|
| 11 |
|
|
[<a class="el" href="group__pavr__hwres__iof.html">IO File</a>]</small>
|
| 12 |
|
|
</h1><table border=0 cellpadding=0 cellspacing=0>
|
| 13 |
|
|
</table>
|
| 14 |
|
|
<dl compact><dt><b>
|
| 15 |
|
|
General IO File port connectivity</b><dd>
|
| 16 |
|
|
<br>
|
| 17 |
|
|
<div align="center">
|
| 18 |
|
|
<img src="pavr_hwres_iof_gen_01.gif" alt="pavr_hwres_iof_gen_01.gif">
|
| 19 |
|
|
</div>
|
| 20 |
|
|
<br>
|
| 21 |
|
|
The general IO File port is a little bit more ellaborated than a simple read/write port. It can read bytes from IO registers to output and write bytes from input to IO registers. Also, it can do some bit processing: load bits (from T flag in SREG to output), store bits (from input to T bit in SREG), set IO bits, clear IO bits. <br>
|
| 22 |
|
|
An opcode has to be provided to specify one of the actions that this port is capable of. <br>
|
| 23 |
|
|
<br>
|
| 24 |
|
|
The following <b>opcodes</b> are implemented for the IO File general port:<ul>
|
| 25 |
|
|
<li>read byte (needed by instructions IN, SBIC, SBIS)<li>write byte (OUT)<li>clear bit (CBI)<li>set bit (SBI)<li>load bit (BLD)<li>store bit (BST)</ul>
|
| 26 |
|
|
</dl><dl compact><dt><b>
|
| 27 |
|
|
Requests to this port</b><dd>
|
| 28 |
|
|
<ul>
|
| 29 |
|
|
<li>pavr_s5_iof_rq <br>
|
| 30 |
|
|
Needed by instructions that manipulate IO File in stage s5: CBI, SBI, SBIC, SBIS, BSET, BCLR, IN, OUT, BLD, BST.<li>pavr_s6_iof_rq <br>
|
| 31 |
|
|
Needed by instructions that manipulate IO File in stage s6: CBI, SBI, BSET, BCLR.<li>pavr_s5_dacu_iof_rq <br>
|
| 32 |
|
|
Needed by loads and stores that are decoded by DACU as accessing IO File. <br>
|
| 33 |
|
|
<br>
|
| 34 |
|
|
</ul>
|
| 35 |
|
|
</dl><hr><address align="right"><small>Generated on Tue Dec 31 20:26:30 2002 for Pipelined AVR microcontroller by
|
| 36 |
|
|
<a href="http://www.doxygen.org/index.html">
|
| 37 |
|
|
<img src="doxygen.png" alt="doxygen" align="middle" border=0
|
| 38 |
|
|
width=110 height=53></a>1.2.16 </small></address>
|
| 39 |
|
|
</body>
|
| 40 |
|
|
</html>
|
