Lpc2000

When I try to execute the CLZ instruction,
I get an undefined instruction exception.
According to the ARM docs, the CLZ insn
is supposed to be implemented on ARM5 and
above, and LPC21xx are ARM7s.  Is this
instruction supposed to work?

You're mixing architecture (ARMv5) with device (ARM7).  I believe most
ARM7s are v4[T].  v5 is ARM9 (at least).  Look at the sheet for your
device to find which architecture it implements.

-- Paul.

> -----Original Message-----
> From: bobbruce000 [mailto:bobbruce000@...] 
> Sent: 04 September 2004 19:39
> To: lpc2000@yahoogroups.com
> Subject: [lpc2000] CLZ instruction
> 
> When I try to execute the CLZ instruction, I get an undefined 
> instruction exception.
> According to the ARM docs, the CLZ insn
> is supposed to be implemented on ARM5 and above, and LPC21xx 
> are ARM7s.  Is this instruction supposed to work?
> 
> 
> 
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At 07:39 PM 9/4/04 +0000, you wrote:
>When I try to execute the CLZ instruction,
>I get an undefined instruction exception.
>According to the ARM docs, the CLZ insn
>is supposed to be implemented on ARM5 and
>above, and LPC21xx are ARM7s.  Is this
>instruction supposed to work?

You are the victim of an unfortunate choice of naming convention used by ARM.

 From http://www.arm.com/pdfs/DVI0027B_7_R3.pdf pg11

"The ARM7TDMI processor core implements the ARMv4T Instruction Set 
Architecture (ISA)."

Note that according to my copy of the ARM Architecture Reference Manual 
(ARM ARM?) that the newest architecture version is 5.

Robert


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