P89LPC932 CCU tutorial

[Ian Bell]

I am trying to get my head around the plethora of registers in the 932's CCU
so I can get a couple of PWM outputs going. The data sheet is not very
clear and the Keil code example I have found helps a bit but I am looking
for a deeper understanding and clearer description of the CCU. Anyone know
of a tutorial or heavily commented code examples?

Ian

 

[Ian Bell]

Hello Ian,

there is a code generator tool called code architect that you can find
at http://www.codearchitect.org/
This generates simply code and helps to get started.

Schwob

Thanks for that but I already knew about that and tried it. Not much use I
am afraid.

Ian

 

[Kohlbach's]

I am trying to get my head around the plethora of registers in the 932's
CCU
so I can get a couple of PWM outputs going. The data sheet is not very
clear and the Keil code example I have found helps a bit but I am looking
for a deeper understanding and clearer description of the CCU. Anyone know
of a tutorial or heavily commented code examples?

Ian

Hi Ian,
I've been in a similar situation over the last few weeks. I got mine working
today after many hours/days/weeks of frustration.

Have you checked the errata sheet for the '932? There are several issues
with the CCU that will stop it working as per the datasheet. I found that
the order of initializing registers is important as well. Are you using
Timer2 in basic or sym/asym mode?

I'd be happy to exchange code snippets if you like. I'm no expert with the
'932 or 'C', just a very determined old hack.

Cheers John

 

[Ian Bell]

Hi Ian,
I've been in a similar situation over the last few weeks. I got mine
working today after many hours/days/weeks of frustration.

Have you checked the errata sheet for the '932? There are several issues
with the CCU that will stop it working as per the datasheet. I found that
the order of initializing registers is important as well. Are you using
Timer2 in basic or sym/asym mode?

I am hoping to use it in sym/asym mode to produce PWM to drive a couple of
DC motors

I found an errata sheet from around 2004 which as you say mentioned several
problems with the CCU, but I can no longer locate it on the Philips web
site - good job I downloaded it.

I'd be happy to exchange code snippets if you like. I'm no expert with the
'932 or 'C', just a very determined old hack.

Cheers John

I have emailed Philips tech support specifically about setting up the 10 bit
prescaler and today I finally got a reply - which they cannot answer the
question and I should phone my nearest sales office!

I would love to trade code snippets. I am a dyed in the wool assembler man
myself as far as the 8051 is concerned but I use C for PC based projects so
that would be fine too

Ian

 

[Kohlbach's]

Hi Ian,
I have sent an email direct to you, wasn't sure about the attachment rules
for this ng.

John