Samsung 8-Bit Instrukcja Użytkownika Strona 357

  • Pobierz
  • Dodaj do moich podręczników
  • Drukuj
  • Strona
    / 462
  • Spis treści
  • BOOKMARKI
  • Oceniono. / 5. Na podstawie oceny klientów
Przeglądanie stron 356
S3C9228/P9228 SAM88RCRI INSTRUCTION SET
6-41
RR Rotate Right
RR dst
Operation: C ¨ dst (0)
dst (7) ¨ dst (0)
dst (n) ¨ dst (n + 1), n = 0–6
The contents of the destination operand are rotated right one bit position. The initial value of bit
zero (LSB) is moved to bit 7 (MSB) and also replaces the carry flag (C).
C
7 0
Flags: C: Set if the bit rotated from the least significant bit position (bit zero) was "1".
Z: Set if the result is "0"; cleared otherwise.
S: Set if the result bit 7 is set; cleared otherwise.
V: Set if arithmetic overflow occurred, that is, if the sign of the destination changed during
rotation; cleared otherwise.
D: Unaffected.
H: Unaffected.
Format:
Bytes Cycles Opcode
(Hex)
Addr Mode
dst
opc dst 2 4 E0 R
4 E1 IR
Examples: Given: Register 00H = 31H, register 01H = 02H, and register 02H = 17H:
RR 00H Register 00H = 98H, C = "1"
RR @01H Register 01H = 02H, register 02H = 8BH, C = "1"
In the first example, if general register 00H contains the value 31H (00110001B), the statement
"RR 00H" rotates this value one bit position to the right. The initial value of bit zero is moved to
bit 7, leaving the new value 98H (10011000B) in the destination register. The initial bit zero also
resets the C flag to "1" and the sign flag and overflow flag are also set to "1".
Przeglądanie stron 356
1 2 ... 352 353 354 355 356 357 358 359 360 361 362 ... 461 462

Komentarze do niniejszej Instrukcji

Brak uwag