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44-Pin Demo Board Lessons
FIGURE 3-12:
PC LOADING AS DESTINATION OF INSTRUCTION
PCH
PCL
Instruction with
12
8
7
0
PCL as
PC
Destination
5
PCLATH<4:0>
8
ALU Result
PCLATH
This lesson uses the look-up table to implement a binary to Gray code converter. Gray
code is a binary code in which only a single bit changes from one sequence to the next.
They are frequently used in encoder applications to avoid wild jumps between states.
Binary encoders are typically implemented as an opaque disk with slots sensed by light
sensors. Due to different threshold levels on different bits, bits may change at slightly
differently times yielding momentary invalid results. Gray code prevents this because
only one bit changes from one sequence to the next. The current code is correct until
it transitions to the next.
The algorithm to convert between binary and Gray code is fairly complex. For a small
number of bits, the table look-up is smaller and faster.
This lesson takes the Analog-to-Digital value upper nibble and converts it to Gray code
displayed on the first four LEDs. The code changes one bit at a time as the potentiom-
eter rotates across its range (seeExample 3-12).
Gray Code Converter
Decimal
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
? 2007 Microchip Technology Inc.
Binary
0000
0001
0011
0010
0110
0111
0101
0100
1100
1101
1111
1110
1010
1011
1001
1000
DS41296B-page 33
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