Tektronix 2212

Digital Circuitry
3- 32
7 Front
Potmeters
(71in~
I
2 Probe Code
Rings
(2 lines) r
Peak+/-
Detector
(2 lines) '
Front Panel
Switches
'
AID Converter
I
j
Chip Select
Clock Pulse
Serial Data In
Serial Data Out
LED-Enable
LED-Latch
' '
'I
Row Select (3 lines)
I
t co .... C7 (8 lines)
68HC05P9
MicroController
'S
aiO
Front Panel LED's
ai
c ..
<U Q)
Q. 1/)
C <U
<U iii
a.o
- Q)
ccr.
E
u.
E-
E-~
u. <ii
Cl)
From Processor Board
Figure 3-8: 2212 Front Panel Block Diagram
Front Panel LED's
LEDs are used to provide visual feedback to the operator about the oscillo-
scope status and operating mode by backlighting the front-panel nomencla-
ture (see diagram 15). A 56-bit status word, defining the diodes to be illumi-
nated, is generated by the processor and then serially clocked into the seven
LED-status registers, 01500 through 01506.
Theory of Operation