a
Errata Sheet
MicroConverter®, Multi-Channel 12-bit
ADCs and DACs with Embedded FLASH MCU
ADuC832
A. This Errata sheet contains the following known bugs, anomalies and work-arounds for the ADuC832 MicroConverter
832_S01. NUMBER OF ADC CLOCKS IN PIPLINED MODE
832_S02. DAC CLEAR BIT FUNCTIONALITY
832_S03. EXTENDED (11-BIT) STACK POINTER - PUSH AND POP OPERATION
B. The Errata listed, apply to all ADuC832 packaged material branded as follows:
First Line:
ADuC832XX
Fourth Line:
BXX
C. Analog Devices Inc. is committed, through future silicon revisions to continuously improve silicon functionality.
Analog Devices Inc. will use its best endeavors to ensure that these future silicon revisions remain compatible with
your present software/systems that implement the recommended work-arounds outlined in this document.
REV. B.1 November/2002
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
® MicroConverter is a Trademark of Analog Devices, Inc.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
Analog Devices, Inc., 2002
ADuC832
832_S01.
Errata Sheet
NUMBER OF ADC CLOCKS IN PIPLINED MODE
Backgound:
An adc conversion takes 16 ADC clocks plus the selected acquisition
clocks.
Issue:
At voltages below 3.5V in piplined mode the number of ADC clocks
required for a conversion can vary between 15 and 16 ADC clocks.
Work-Around :
none.
Related Issues :
This issue does not affect the performance of the ADC.
832_S02. DAC CLEAR BIT FUNCTIONALITY
Backgound:
The DAC outputs are controlled by the SFR DACCON. The CLR1 and
CLR0 bits in DACCON can be used to force the output of DAC1 and
DAC0 to 0V.
Issue:
When the DAC is enabled and in buffered mode setting the CLR1 or
CLR0 bits may cause a momentary spike on the DAC ouput before the
DAC is forced to 0V.
Work-Around :
To force the output of DAC1 or DAC0 to 0V write 0000H to the
corresponding DAC data registers.
Related Issues :
none.
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ADuC832
Errata Sheet
832_S03. EXTENDED (11-BIT) STACK POINTER - PUSH AND POP OPERATION
Backgound:
Issue:
The ADuC832 offers an extended (11-bit) stack pointer that allows the
stack to extend into the 2 KBytes of internal XRAM. This can be very
useful where embedded functions are used.
If the extended stack pointer is enabled (CFG832.7=1) and the stack
points to the extended stack space (SPH>=1) the the PUSH direct or POP
direct instructions will not operate correctly if the direct address is less than
80H (i.e. not an SFR)
Work-Around :
Assembly Programming:
By using the
Accumulator the extended stack works correctly. e.g.
To PUSH:MOV
PUSH
A,0
To POP: POP
ACC
MOV
0,A
ACC
C Programming (KEIL Compier):
The KEIL Compiler only ever pushes (or pops) and SFR or any of the 32
registers (4 banks of 8 registers) onto the stack. Keil support a compiler
directive that disables absolute register addressing (#pragma NOAREGS).
Using this directive a PUSH/POP register will be automatically changed
as above.
#pragma NOAREGS
int increment(int);
void main(void)
{
int a,b,c;
a=5;
b=6;
c=increment(a)+increment(b);
while(1);
}
int increment(int
{
return(a+1);
}
Related Issues :
a)
none.
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