Whats the difference between I/0 port of PSD & MCU ?

[gigifazio]

PSD & MCU Port

Hello!!

what is the difference whit the I/O port of MCU P1,P3,P4 and the I/O port OF PSD PortA, PortB,PortC, PortD..

Can help me please??


I'm using uPSD3334D of ST

 

[rasasi78]

Re: PSD & MCU Port

They are basicly I/O ports. The difference is that P1,P3,P4 are directly attached to the MCU (8051) and the PA,PB,PC,PD are the output of the PSD unit which includes a PLD with macrocells, and several other data/control lines.

P1-P4 have different functions such as serial ports, SPI. While PA-PD includes other "less" standard functionalities as JTAG.

You can find more info on the st web.

 

[gigifazio]

Re: PSD & MCU Port

Thx
i see the info in ST WEB but not is cleary ...

 

[rasasi78]

PSD & MCU Port

You can look http://mcu.st.com/mcu/inchtml.php?fdir=pages&fnam=upsd3300
which is the web page for the uPSD33xx.

You can look also the datasheet **broken link removed** in the after the TOC you can find a list of the pins and their functionalities.