Zilog Z80380 Manual do Utilizador descarregar pdf (Página 45)

5-11

Z380

™

USER'S MANUAL

ZILOG

DC-8297-03

5.5.6 8-Bit Manipulation, Rotate and Shift

Group

Instructions in this group (Table 5-11) test, set, and reset

bits within bytes, and rotate and shift byte data one bit

position. Bits to be manipulated are specified by a field

within the instruction. Rotate can optionally concatenate

the Carry flag to the byte to be manipulated. Both left and

right shifting is supported. Right shifts can either shift 0 into

bit 7 (logical shifts), or can replicate the sign in bits 6 and

7 (arithmetic shifts). All these instructions, Set Bit and

Reset Bit, set the CPU flags according to the calculated

result; the operand can be a register or a memory location

specified by the Indirect Register or Indexed addressing

mode.

The RLD and RRD instructions are provided for manipulat-

ing strings of BCD digits; these rotate 4-bit quantities in

memory specified by the Indirect Register. The low-order

four bits of the accumulator are used as a link between

rotation of successive bytes.

Table 5-11. Bit Set/Reset/Test, Rotate and Shift Group

Instruction Name Format A B C D E H L (HL) (IX+d) (IY+d)

Bit Test BIT dst √√√√√√√√√√

Reset Bit RES dst √√√√√√√√√√

Rotate Left RL dst √√√√√√√√√√

Rotate Left Accumulator RLA √

Rotate Left Circular RLC dst √√√√√√√√√√

Rotate Left Circular (Accumulator) RLCA √

Rotate Left Digit RLD √

Rotate Right RR dst √√√√√√√√√√

Rotate Right Accumulator RRA √

Rotate Right Circular RRC dst √√√√√√√√√√

Rotate Right Circular (Accumulator) RRCA √

Rotate Right Digit RRD √

Set Bit SET dst √√√√√√√√√√

Shift Left Arithmetic SLA dst √√√√√√√√√√

Shift Right Arithmetic SRA dst √√√√√√√√√√

Shift Right Logical SRL √√√√√√√√√√

5.5.7 16-Bit Manipulation, Rotate and Shift

Group

Instructions in this group (Table 5-12) rotate and shift word

data one bit position. Rotate can optionally concatenate

the Carry flag to the word to be manipulated. Both left and

right shifting is supported. Right shifts can either shift 0 into

bit 15 (logical shifts), or can replicate the sign in bits 14 and

15 (arithmetic shifts). The operand can be a register pair or

memory location specified by the Indirect Register or

Indexed addressing mode, as shown below.

Table 5-12. 16-Bit Rotate and Shift Group.

Destination

Instruction Name Format BC DE HL IX IY (HL) (HL) (IX+d) (IY+d)

Rotate Left Word RLW dst √√√√√√√ √ √

Rotate Left Circular Word RLCW dst √√√√√√√ √ √

Rotate Right Word RRW dst √√√√√√√ √ √

Rotate Right Circular Word RRCW dst √√√√√√√ √ √

Shift Left Arithmetic Word SLAW dst √√√√√√√ √ √

Shift Right Arithmetic Word SRAW dst √√√√√√√ √ √

Shift Right Logical Word SRLW √√√√√√√ √ √

1 2 ... 40 41 42 43 44 45 46 47 48 49 50 ... 267 268

Comentários a estes Manuais

Sem comentários

Zilog Z80380 Manual do Utilizador Página 45

Comentários a estes Manuais

Manuais e produtos relacionados com Sensores Zilog Z80380