CYASM ASSEMBLER USER'S GUIDE VERSION 1.77

RRC Rotate Right through Carry RRC
Syntax:
RRC A or RRC
Operation:
CF → b 7 - - - - - - b 0
Description: Shifts all bits of the accumulator one place to the right. The carry flag is loaded into the
most significant bit of the accumulator, bit 7. Bit 0 of the accumulator is loaded into the
Carry flag.
Condition Flags:
CF: Set if LSB of the accumulator was set, before the shift, cleared otherwise.
ZF: Set if the result is zero; cleared otherwise.
Source Machine Code Cycles
Format Opcode Operand
RRC A 3Eh 4
SUB Subtract without Borrow SUB
Syntax:
Operation:
SUB A, expr
acc ← acc - k
SUB A, [expr]
acc ← acc - [k]
SUB A, [X + expr] acc ← acc - [X + k]
Description:
Subtracts a value; k, [k] or [X+ k] from the contents of the accumulator and places the
result in the accumulator.
Condition Flags:
CF:
ZF:
Set if, treating the numbers as unsigned, the result < 0; cleared otherwise.
Set if the result is zero; cleared otherwise.
Source Machine Code Cycles
Format Opcode Operand
SUB A, expr 07h Immediate byte 4
SUB A, [expr] 08h Direct address byte 6
SUB A, [X+expr] 09h Offset byte 7
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