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ROLC (Rotate Left through Carry)

The ROLC instruction rotates the byte in TOS one bit to the left, using the Carry

flag as an input bit. The ROLC instruction uses the implicit addressing mode.

Bit 0 is loaded from the Carry flag. After the operation completes, the Carry flag

contains the value from bit 7.

Figure 9 shows the operation of the ROLC instruction.

TOS

7 0

Figure 9. The ROLC Instruction

The ROLC instruction applies to Series 3100, 5000, and 6000 devices.

Syntax:

The ROLC instruction requires no operands:

ROLC

Table 46 describes the attributes of the ROLC instruction.

Table 46. ROLC Instruction

Instruction Hexadecimal

Opcode

Instruction

Size (Bytes)

CPU Cycles

Required

Affect on

Carry Flag

ROLC 39 1 2 Used, modified

Example:

The following example pushes the number 150 (h’96) onto the data stack, and

then uses the ROLC instruction to rotate the TOS value left through the Carry

flag. This example assumes that the Carry flag is not set (has value 0). After the

ROLC instruction completes, TOS has the value 44 (h’2C) and the Carry flag is

set (has value 1 from bit 7 of the original h’96 in TOS).

push #d’150 ; ( d’150, -- )

rolc ; ( d’44, -- )

112 Neuron Assembly Language Instruction Statements

1 2 ... 117 118 119 120 121 122 123 124 125 126 127 ... 236 237

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Echelon Neuron Bedienungsanleitung Seite 122