"MetalHead" <WanderingMetalHead@DUMPSPAM.yahoo.com> wrote in message
news:huzBf.1711$wk5.999@news02.roc.ny...
> john wrote:
> > Hi,
> >
> > I am having problems with the port B. Its an output port and I am
> > writing the whole port. My code is as follows
> >
> > ORG 2000
> > LDAA $# FF
> > STAA $1004
> >
> > Now, if I write 00 hex or FF to theport. The port is always floating.
> > I tried pull ups and pull downs but no difference. Please advice.
> > Thanks
>
> A couple of questions:
> Which 68HC11 variant are you using?
> Are you using it in single chip or expanded mode?
>
> The only HC11 docs I have, show port B as an output only port and don't
> show any way to disable the output transistors. up right or is cooked.
>
> Good Luck,
> Bob
Hi John,
I have to agree with Bob, we need to know what variation of the HC11 you are
using and the mode it's operating in.
Also are you sure you really want your program to start at 2000 decimal (Or
7Dh). All the memory maps I've checked don't appear to have anything useable
for a programmer at this location.
Hope this helps,
James
Reply by CBFalconer●January 24, 20062006-01-24
john wrote:
>
> I do not know how not to top post. please advice. I tried both
> syntaxs the result is same.
> Hi,
>
> I am having problems with the port B. Its an output port and I am
> writing the whole port. My code is as follows
>
> ORG 2000
> LDAA $# FF
> STAA $1004
>
> Now, if I write 00 hex or FF to theport. The port is always floating.
> I tried pull ups and pull downs but no difference. Please advice.
> Thanks
A couple of questions:
Which 68HC11 variant are you using?
Are you using it in single chip or expanded mode?
The only HC11 docs I have, show port B as an output only port and don't
show any way to disable the output transistors. Is your port truly
floating or is it just not responding to the input register? The docs I
have are for an A8, E2 or E9 part. If the port really is floating and
the part is powered up and grounded properly, it is possible that the
port is cooked.
If you are using the HC11 in normal, single chip mode, the MODB pin
should be tied to +5v through a resistor and the MODA pin tied to
ground. If the MODA pin is not grounded, the data register cannot be
written by the data bus, it's stuck as the high order address bus. If
you are using an expanded mode with the port replacement chip, I would
suspect that the port replacement chip is not set up right or is cooked.
Good Luck,
Bob
Reply by James Beck●January 24, 20062006-01-24
This is top posting.
In article <1138127807.972537.169750@o13g2000cwo.googlegroups.com>,
conphiloso@hotmail.com says...
> Hi,
>
> I do not know how not to top post. please advice. I tried both syntaxs
> the result is same.
>
This is where you should respond.
If you need to snip old junk to keep the post manageable that's fine.
Anyway, I'm sure your little code snippet is not the entire file you are
assembling, or is it? You should have reset vectors defined and the
like.
Your complete file should be a little more in depth.
For example, this assembly routine to alter the CONFIG register :
; THE 'HC11 MUST BE IN ONE OF THE SPECIAL MODES TO PROG. CONFIG
; CHANGES WON'T TAKE UNTIL RESET
; ASSUMES AN HC11Ax WITH AN 8MHZ OSC (2MHZ ECLOCK)
ORG $A000
EX31A LDS #$00FF ;set stack ptr
LDAA #$00 ;turn off EEPROM protect
STAA $1035 ;write it
LDAA #$00 ;preset porta
STAA $1000 ;write it
LDAA #$0F ;set porta
STAA $1001 ;write to ddr
BSR DLY10 ;delay 10 ms
LDAA #$0A ;get desired config value (change if
needed)
; 0a = COP,NOEEPROM
CMPA $103F ;compare it to the actual value
BEQ NOWOK ;if it is OK goto nowok
;else do this
LDAB #$16
STAB $103B ;SETUP PPROG REGISTER FOR BYTE ERASE
STAA $103F ;DO ANY WRITE TO THE REGISTER
INCB
STAB $103B ;TURN ON THE PROG VOLTAGE
BSR DLY10 ;DELAY 10MS
CLR $103B ; TURN OFF THE PROG VOLTAGE
LDAB #$02
STAB $103B ;SETUP TO WRITE THE DATA
STAA $103F ; NOW WRITE THE ACTUAL DATA
INCB
STAB $103B ; TURN ON THE PROG VOLTAGE
BSR DLY10 ; WAIT AGAIN
CLR $103B ; TURN OFF EVERYTHING
PROGED LDAA #$08 ; FLIP A PORT BIT
STAA $1000 ; I USE THIS BIT TO TOGGLE AN LED
BRA PROGED ; WAIT FOR RESET
NOWOK LDAA #$04 ;IF CONFIG VALUE OK FLIP DIFFERENT BIT
STAA $1000
BRA NOWOK ; WAIT FOREVER
DLY10 PSHX ; HARD CODED 10MS DELAY BASED ON ABOVE
ASSUMPTIONS
LDX #$1A0C
DLOOP DEX
BNE DLOOP
PULX
RTS
ORG $BFFE
RESET FDB $A000
Reply by john●January 24, 20062006-01-24
Hi,
I do not know how not to top post. please advice. I tried both syntaxs
the result is same.
John
Reply by karel●January 24, 20062006-01-24
"James Beck" <jim@reallykillersystems.com> schreef in bericht
news:MPG.1e4034b094788da2989c18@news.west.earthlink.net...
> In article <1138125287.812767.71340@g43g2000cwa.googlegroups.com>,
> conphiloso@hotmail.com says...
>
> TOP POST FIXED
>
> James Beck wrote:
>> In article <43d659f0$0$29459$ba620e4c@news.skynet.be>,
>> adelcoGENE@zeverSKYNET.BE says...
>> >
>> > Since you want ALL bits to be outputs, write #$FF to the DDRB.
>> >
>> >
>> >
>> No DDRB, it is an output only.
>> At least on all of the variants I have on hand.
>> Hi,
>>
>> The port B is an ouput port. why do I need to set its direction ?
>>
>> Please advice!
>>
>>
>>
> I think that's what I said........
> BTW, since it is an output only port it shouldn't be "floating" either.
This "floating" bit confirmed my idea that it was configured as an input
Reply by karel●January 24, 20062006-01-24
"john" <conphiloso@hotmail.com> schreef in bericht
news:1138125287.812767.71340@g43g2000cwa.googlegroups.com...
> Thanks
> John
> James Beck wrote:
>> In article <43d659f0$0$29459$ba620e4c@news.skynet.be>,
>> adelcoGENE@zeverSKYNET.BE says...
>> >
>> > "James Beck" <jim@reallykillersystems.com> schreef in bericht
>> > news:MPG.1e400edf364e9b3989c14@news.west.earthlink.net...
>> > > In article <1138114456.450664.271660@f14g2000cwb.googlegroups.com>,
>> > > conphiloso@hotmail.com says...
>> > >> Hi,
>> > >>
>> > >> I am having problems with the port B. Its an output port and I am
>> > >> writing the whole port. My code is as follows
>> > >>
>> > >> ORG 2000
>> > >> LDAA $# FF
>> > >
>> > > Try LDAA #$0ff
>> >
>> > That's one step forward.
>> > (did your assembler not splutter at the $#FF?)
>> >
>> > More important yet: at power up, all ports are configured as inputs.
>> > So before they can serve as outputs, you must tell them to
>> > become outputs. Do this by writing 1 to the relative bits in the
>> > corresponding data direction register. On an 6812 it is called DDRB,
>> > suppose it's the same on 6811.
>> > Since you want ALL bits to be outputs, write #$FF to the DDRB.
>> >
>> >
>> >
>> No DDRB, it is an output only.
>> At least on all of the variants I have on hand.
>
> The port B is an ouput port. why do I need to set its direction ?
That is exactly what James was saying.
It is I that was mistaken - not knowing the 6811
I assumed it would behave like the 6812 I do have experience with.
> Please advice!
Do not top post
Seriously though, I can only assume the problem is in your syntax
(as was already suggested):
you wrote $#FF where it should have been #$FF
So I repeat my question: did your assembler accept that phrase?
What does the assembly listing show?
KA
Reply by john●January 24, 20062006-01-24
Hi,
any solutions!
John
Reply by James Beck●January 24, 20062006-01-24
In article <1138125287.812767.71340@g43g2000cwa.googlegroups.com>,
conphiloso@hotmail.com says...
TOP POST FIXED
James Beck wrote:
> In article <43d659f0$0$29459$ba620e4c@news.skynet.be>,
> adelcoGENE@zeverSKYNET.BE says...
> >
> > "James Beck" <jim@reallykillersystems.com> schreef in bericht
> > news:MPG.1e400edf364e9b3989c14@news.west.earthlink.net...
> > > In article <1138114456.450664.271660@f14g2000cwb.googlegroups.com>,
> > > conphiloso@hotmail.com says...
> > >> Hi,
> > >>
> > >> I am having problems with the port B. Its an output port and I am
> > >> writing the whole port. My code is as follows
> > >>
> > >> ORG 2000
> > >> LDAA $# FF
> > >
> > > Try LDAA #$0ff
> >
> > That's one step forward.
> > (did your assembler not splutter at the $#FF?)
> >
> > More important yet: at power up, all ports are configured as inputs.
> > So before they can serve as outputs, you must tell them to
> > become outputs. Do this by writing 1 to the relative bits in the
> > corresponding data direction register. On an 6812 it is called DDRB,
> > suppose it's the same on 6811.
> > Since you want ALL bits to be outputs, write #$FF to the DDRB.
> >
> >
> >
> No DDRB, it is an output only.
> At least on all of the variants I have on hand.
> Hi,
>
> The port B is an ouput port. why do I need to set its direction ?
>
> Please advice!
>
>
>
I think that's what I said........
BTW, since it is an output only port it shouldn't be "floating" either.
JIm
Reply by john●January 24, 20062006-01-24
Hi,
The port B is an ouput port. why do I need to set its direction ?
Please advice!
Thanks
John
James Beck wrote:
> In article <43d659f0$0$29459$ba620e4c@news.skynet.be>,
> adelcoGENE@zeverSKYNET.BE says...
> >
> > "James Beck" <jim@reallykillersystems.com> schreef in bericht
> > news:MPG.1e400edf364e9b3989c14@news.west.earthlink.net...
> > > In article <1138114456.450664.271660@f14g2000cwb.googlegroups.com>,
> > > conphiloso@hotmail.com says...
> > >> Hi,
> > >>
> > >> I am having problems with the port B. Its an output port and I am
> > >> writing the whole port. My code is as follows
> > >>
> > >> ORG 2000
> > >> LDAA $# FF
> > >
> > > Try LDAA #$0ff
> >
> > That's one step forward.
> > (did your assembler not splutter at the $#FF?)
> >
> > More important yet: at power up, all ports are configured as inputs.
> > So before they can serve as outputs, you must tell them to
> > become outputs. Do this by writing 1 to the relative bits in the
> > corresponding data direction register. On an 6812 it is called DDRB,
> > suppose it's the same on 6811.
> > Since you want ALL bits to be outputs, write #$FF to the DDRB.
> >
> >
> >
> No DDRB, it is an output only.
> At least on all of the variants I have on hand.