Page 62 - Introduction to Microcontrollers Architecture, Programming, and Interfacing of The Motorola 68HC12

2,3 Logic Instructions 39

Table 2.6. Logic Instructions

Consider this example. Suppose that we need to clear bits 0 and 4; set bits 5,6, and 7;
and leave bits 1,2, and 3 unmodified in accumulator A. The following instructions carry
out these modifications.
ORAA #$EO Set bits 5,6, and 7, leaving others unchanged
ANDA #$EE Clear bits 0 and 4, leaving others unchanged

1011010 1 <- contents of $817
AND 0001110 0 <- initial value of B
0001010 0 <- final value of B
b. Logical Operation
Figure 2.11. Bit-by-Bit AND