diff --git a/lab1/lab1_notes.txt b/lab1/lab1_notes.txt index 7d75e6d..c4416c4 100644 --- a/lab1/lab1_notes.txt +++ b/lab1/lab1_notes.txt @@ -42,19 +42,21 @@ The 4-digit 7-segment multiplexed display has seven inputs: - 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: +A brief circuit diagramme for wiring up the switches to the Dx inputs, the button to the strobe, and Ax: Ohmm... -+5V ----VVVV------------------------------------------------------------| ++5V ____VVV_____________________________________________________________ | __ | __ | __ | __ | - |_____| | |_____| | |_____| | |_____| | | - ______|SW| ______|SW| ______|SW| ______|SW| |__ set manually - | GRD-|__| | GRD-|__| | GRD-|__| | GRD-|__| | O| to select digit + |_____| | |_____| | |_____| | |_____| | | set manually with + ______|SW| ______|SW| ______|SW| ______|SW| |__ ground or power + | GRD_|__| | GRD_|__| | GRD_|__| | GRD_|__| | O| to select digit | | | | |__| | | | | | | | | | D3 D2 D1 D0 STR A1 A0 - __ __ __ __ - |__| |__| |__| |__| - |__| |__| |__| |__| + _____________________________________________________ + | __ __ __ __ | + | |__| |__| |__| |__| | + | |__| |__| |__| |__| | + |_____________________________________________________| 11 10 01 00 == A1 A0