Z8 Microcontrollers
Instruction Descriptions and Formats ZiLOG
12-48 UM001601-0803
OR
LOGICAL OR
Example:
If Working Register R4 contains F9H (11111001B), Working Register R13 contains 7BH, and Register 7B contains
6AH (01101010B), the statement:
OR R4, @R13
Op Code: 43 4D
leaves the value FBH (11111011B) in Working Register R4. The S Flag is set, and the Z and V Flags are cleared.
Example:
If Register 3AH contains the value F5H (11110101B) and Register 42H contains the value 0AH (00001010), the
statement:
OR 3AH, 42H
Op Code: 44 42 3A
leaves the value FFH (11111111B) in Register 3AH. The S Flag is set, and the Z and V Flags are cleared.
Example:
If Working Register R5 contains 70H (01110000B), Register 45H contains 3AH, and Register 3AH contains 7FH
(01111111B), the statement:
OR R5, @45H
Op Code: 45 45 E5
leaves the value 7FH (01111111B) in Working Register R5. The Z, V, and S Flags are cleared.
Example:
If Register 7AH contains the value F3H (11110111B), the statement:
OR 7AH, #F0H
Op Code: 46 7A F0
leaves the value F3H (11110111B) in Register 7AH. The S Flag is set, and the Z and V Flags are cleared.
Example:
If Working Register R3 contains the value 3EH and Register 3EH contains the value 0CH (00001100B), the
statement:
OR @R3, #05H
Op Code: 57 E3 05
leaves the value 0DH (00001101B) in Register 3EH. The Z, V, and S Flags are cleared.
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