Microprocessor
Circuit
2212 Service Manual
Digital Circuitry
This section contains the descriptions of the circuitry
on
the
A15
processor
board
and
the
A12
frontboard. The A15 board assembly contains the
following circuitry :
- Main microprocessor (Diagram 18)
- Digital acquisition (diagram 16 and 17)
Digital display circuitry (readout, cursors
and
waveform display)
(diagram
19)
- Parallel interface circuitry (diagram 21)
- Communication options (diagram
22
and
23)
Power connections of the IC's on the A15 board are located on diagram 20A
and
20B.
The
A12
board assembly contains the following circuitry:
- Front panel switches (diagram 14)
- Front panel
LED's
(diagram 15)
Diagrams are located in section
9:
Diagrams. See also
the
block diagrams
in
this section
for
an overview of the circuits concerned.
The core of the digital system is a 68070 microprocessor, which basically is a
68000 derivative with build-in peripherals. Of these internal functions the
following are used
in
the 2212:
- The two channel
DMA
controller used
in
the display
and
acquisition
systems.
- The UART
for
serial communication (optional).
- I
2
C bus for communication with
EEROM
on the analog mainboard AlO.
- Timer for several timing tasks.
The 68070 processor (U1801 diagram 18) has a 16 bits databus
(PROD
(0
.... 15]) and a
23
bits address bus (PROA (1.. .. 23]).
Because
it
uses a 16 bits wide databus, the least significant address line is
Al.
3-
19
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