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ADUC832BSZ Arkusz danych(PDF) 3 Page - Analog Devices

Numer części ADUC832BSZ
Szczegółowy opis  MicroConverter짰, Multi-Channel 12-bit ADCs and DACs with Embedded FLASH MCU
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ADUC832BSZ Arkusz danych(HTML) 3 Page - Analog Devices

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REV. B.1 November/2002
832_S03. EXTENDED (11-BIT) STACK POINTER - PUSH AND POP OPERATION
ADuC832
Errata Sheet
Backgound:
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.
Issue:
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
A,0
To POP: POP
ACC
PUSH
ACC
MOV
0,A
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
a)
{
return(a+1);
}
Related Issues :
none.


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