Olympus OEP-3, Service Manual

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4-8
OEP-3 V1 (UC)
Time-sharing timing
Command communication with SY board
The command communication with the SY board is performed by the bi-directional asynchronous serial
communication in which the serial communication port of CPU is used.
Asynchronous serial communication
.
Start bit: 1
.
Data bit: 8
.
Stop bit: 1
.
Parity bit: None
.
Baud rate: 19200 bps
HBLNK
VBLNK
DLYD_HD
A B C
(1)
(3) (2)
(1) VBLNK period
. DRAM access
. VF judgment
. Write of color adjustment data
(2) HBLNK period
. DRAM access
(3) Effective screen period
. DRAM access
. Input and output of capture or monitor output image data
(A) DRAM refresh
(B) DRAM access of capture or monitor output image data
(C) Output of print data, and write or read of caption data