RCA Spectra 70

Compare Halfword
(CH)
------
General Description
Format
(RX)
Condition Code
Interrupt Action
Fixed-Point
InstrucUons
• The operand specified by the first address (R
1
)
is compared with the
halfword operand expanded to a full word, specified by the second address
(XdB
2
/D
2
). Both operands remain unaltered. The result of the comparison
determines
the condition code setting.
o
7 8 11 12 15 16 19 20
• 0 - operands are equal.
1 -
the operand specified by the first address is low.
2 -
the operand specified by the first address is high.
3-not used.
• Address error:
Addressing.
S pecifica tion.
31
Notes • 1. The halfword in storage specified by the second address is expanded
to full-word length by propagating the sign bit value through the
16 high-order positions.
2.
Both operands are considered as 32-bit signed integers and the
comparison is algebraic.
141