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TECHNICAL DESCRIPTION
VIDEO IN
EV-COM
Inter-module
serial comm.
Figure 6-12: 632 Module Block Diagram
The microcontroller, gen-lock sync separator and support circuits are
contained on the main circuit card (6120).
circuitry is contained on a separate sub-module (6231) which plugs into the
main module.
Video input buffers and all input/output connectors are
contained on a separate I/O module, (7006) into which the 632 module
plugs in. The relevant schematic drawings are shown in brackets for each
section of the circuit.
6.7.1
Microcontroller (6320-31, 6320-32)
At the heart of the 632 character generator module is a DS87C520
microcontroller, (MCU) U2. Its three 8 bit bi-directional ports and 8 bit bus
provide peripheral interfacing to the rest of the circuits. Program memory is
contained on Flash EPROM U4. Boot-up program memory and data RAM
are provided internally by the MCU. UART U8 provides parallel inputs and
outputs from the remote control connector and serial I/O for the RS-232
port that interfaces to the computer running the KeyLog TRACKER™
software. PALs U7 and U16 contain miscellaneous glue logic and address
decoding for devices on the board.
An onboard oscillator, also part of the MCU, is crystal controlled.
11.50849 MHz frequency is internally divided by 12, resulting in a
processor operating frequency of approximately 960 KHz.
6.7.2
Sync Separator (6320-33)
Composite video, buffered on the separate I/O module, and on the main
PCB by Q1 is AC coupled into sync separator U9. The sync separator
provides a Frame pulse REFF1 (active low for field 1) to the MCU through
PAL U16.
Model 4025TR Film Footage Encoder Manual
SERIAL I/O
VIDEO + CHAR OUT
MAIN PROCESSOR
CHAR. GENERATOR
FORMATING SWITCHES
The character generator
Page 6-20
Its'
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