
S3C8248/C8245/P8245/C8247/C8249/P8249
INSTRUCTION SET
6-35
DEC
—
Decrement
DEC
dst
Operation:
dst
←
dst – 1
The contents of the destination operand are decremented by one.
Flags:
C:
Unaffected.
Z:
Set if the result is "0"; cleared otherwise.
S:
Set if result is negative; cleared otherwise.
V:
Set if arithmetic overflow occurred; cleared otherwise.
D:
Unaffected.
H:
Unaffected.
Format:
Bytes
Cycles
Opcode
(Hex)
Addr Mode
dst
opc
dst
2
4
00
R
4
01
IR
Examples:
Given: R1 = 03H and register 03H = 10H:
DEC
R1
→
R1 = 02H
DEC
@R1
→
Register 03H = 0FH
In the first example, if working register R1 contains the value 03H, the statement "DEC R1"
decrements the hexadecimal value by one, leaving the value 02H. In the second example, the
statement "DEC @R1" decrements the value 10H contained in the destination register 03H by
one, leaving the value 0FH.
Summary of Contents for C8245
Page 31: ...ADDRESS SPACES S3C8248 C8245 P8245 C8247 C8249 P8249 2 20 NOTES ...
Page 107: ...INTERRUPT STRUCTURE S3C8248 C8245 P8245 C8247 C8249 P8249 5 18 NOTES ...
Page 195: ...INSTRUCTION SET S3C8248 C8245 P8245 C8247 C8249 P8249 6 88 NOTES ...
Page 221: ...I O PORTS S3C8248 C8245 P8245 C8247 C8249 P8249 9 16 NOTES ...
Page 245: ...16 BIT TIMER 0 1 S3C8248 C8245 P8245 C8247 C8249 P8249 12 10 NOTES ...
Page 249: ...WATCH TIMER S3C8248 C8245 P8245 C8247 C8249 P8249 13 4 NOTES ...
Page 267: ...A D CONVERTER S3C8248 C8245 P8245 C8247 C8249 P8249 15 6 NOTES ...
Page 299: ...S3P8245 P8249 OTP S3C8248 C8245 P8245 C8247 C8249 P8249 21 8 NOTES ...
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