Takes a single operand and lights the LEDs as follows.
If the operand is a value: It uses the lowest five bits of the operand
to determine how to actuate the LEDs. The lowest three bits denote the
3 LEDs; bit 0 is red, bit 1 is green, and bit 2 is yellow. The next two
bits (3 and 4) specify which operation to apply; 00 is set, 01 is off
(active on 0), 10 is on, and 11 is toggle. For example, 31 (0x1f) toggles
all three LEDs, 19 turns the red and green off (leaving yellow unchanged),
and 0x2 sets the LEDS to be red off, green on, and yellow off.
| Operation |
Binary Value
|
Decimal Value
|
| set only red on |
00001
|
1
|
| set only green on |
00010
|
2
|
| set only yellow on |
00100
|
4
|
| Toggle red |
11001
|
25
|
| Toggle green |
11010
|
26
|
| Toggle yellow |
11100
|
28
|
| Toggle all 3 LEDs |
11111
|
31
|
| Turn off red |
01110
|
14
|
| Turn off green |
01101
|
13
|
| Turn off yellow |
01011
|
11
|
| Turn off all 3 LEDs |
01000
|
8
|
| Turn on red |
10001
|
17
|
| Turn on green |
10010
|
18
|
| Turn on yellow |
10100
|
20
|
| Turn on all LEDs |
10111
|
23
|
If the operand is a reading, it simply displays the lower 3 bits in on
the LEDs.
|