Zilog Z8F0130 - Manual (Page 254)

eZ8
™
CPU Core
User Manual
UM012820-0810 TCM Instruction
239
TCM
Definition
Test Complement Under Mask.
Syntax
TCM dst, src
Operation
(NOT dst) AND src
Description
This instruction tests selected bits in the destination operand for a logical
1 value. Specify the bits to be tested by setting a 1 bit in the corresponding
bit position in the source operand (the mask). The TCM instruction com-
plements the destination operand and AND’s it with the source mask
(operand). Check the Zero flag to determine the result. If the Z flag is set,
the tested bits were 1. When a TCM operation is completed, the destina-
tion and source operands retain their original values.
Flags
C Unaffected
Z Set if the result is zero; reset otherwise
S Set if Bit 7 of the result is set; reset otherwise
V Reset to 0
D Unaffected
H Unaffected