UPD17P136ACT datasheet(112/292 Pages) NEC

112 / 292 page

CHAPTER 11 ARITHMETIC AND LOGIC UNIT (ALU)

11.4 LOGICAL OPERATIONS

As shown in Table 11-4, logical operations consist of logical OR, logical AND, and logical XOR. Accordingly, the

logical operation instructions are OR, AND, and XOR.

The OR, AND, and XOR instructions can be performed on either the general register and data memory, or on data

memory and immediate data. The operands of these instructions are specified in the same way as for arithmetic

operations (“r, m” or “m, #n4”).

Logical operations are not affected by the BCD or CMP flags in the program status word (PSWORD). Logical

operations do not cause either the CY or Z flag in the program status word (PSWORD) to be set. However, when

the index enable flag (IXE) is set (1), index modification is performed using the index register.

Table 11-4. Logical Operations

Table 11-5. Table of True Values for Logical Operations

Logical AND

C = A AND B

Logical OR

C = A OR B

Logical XOR

C = A XOR B

General register and data memory

OR r, m

Data memory and immediate data

OR m, #n4

General register and data memory

AND r, m

Data memory and immediate data

AND m, #n4

General register and data memory

XOR r, m

Data memory and immediate data

XOR m, #n4

Logical

operation

Logical OR

Logical AND

Logical XOR

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