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Lab 1 notes

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Jonathan Chan 2018-01-09 15:31:38 -08:00
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One breadboard's layout resembles this (there are two):
------------------ -------------------
------------------ -------------------
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------------------ -------------------
------------------ -------------------
In V_OH, V_IH, V_OL, V_IL,
- The O/I means it's the voltage output/input
- The H/L means it's a voltage HI/LO (or 1/0)
Max and min are the maximum and minimum acceptable voltage for that input/output for HI/LO.
e.g. A gate's acceptable voltages may look like the following:
+5V
||| max
|||
||| V_IH
|||
||| min
|
|
|
|
|
||| max
||| V_IL
||| min
=0V
The 4-digit 7-segment multiplexed display has seven inputs:
- D3 D2 D1 D0: the input for a single digit, from 0x0 to 0xF
- A1 A0: the input for selecting a digit, where 0b11 is leftmost and 0b00 is rightmost
- STR: when this voltage goes from LO to HI, the value given by Dx is loaded into the digit selected by Ax
A brief circuit diagramme:
Ohmm...
+5V ----VVVV------------------------------------------------------------|
| __ | __ | __ | __ |
|_____| | |_____| | |_____| | |_____| | |
______|SW| ______|SW| ______|SW| ______|SW| |__ set manually
| GRD-|__| | GRD-|__| | GRD-|__| | GRD-|__| | O| to select digit
| | | | |__| | |
| | | | | | |
D3 D2 D1 D0 STR A1 A0
__ __ __ __
|__| |__| |__| |__|
|__| |__| |__| |__|
11 10 01 00 == A1 A0