Pla Of The A-1 - Canon A-1 Repair Manual

TV
Ho
AV
Ho
48
de
-
de
and makes AE photography possible
by
controlling the
camera's exposure computation system according to
the computed values obtained
by
the corresponding
programmed sequence.
The A-I has many functions full of possibilities.
AE lobde
AE Flash Hode
TV AE
oLEma
o Flash AE
o Plash mode
Me
o Shutter Speed
Auto
Au to
Auto
Le
1/30-1/1000,8
Manual
Leos
Manual
Manual
o Shutter
Speed
tering
na Fully
en
~
Stopped-down
AE
.
X
X
1/60 or
slower
than 1/60
Me
vi
Le
St
tering
th the
ns
opped-
Down
f--
AV AE
Me
Lens
Auto
X
X
vi
Manual
I.e
Programmed AE Mode
Op
Fig . 14 PLA of the A-l
As explained above, the A-l e nables the photographer
to use it in many ways owi n g t o the built-in PLA
which 1s capable of detecting which AE photography
mode has been chosen and controlling the camera
operation
by
means of the program
designated.
(Figure
10)
tering
th the
na Fully
en
(9) Bus Line System
The A-I has employed the bus line system for its
data transmission. To put it simply, the bus line is
divided into two main lines. One is for input of
data into the CPU after subject brightness has been
converted into the digital form and the other one is
for transmitting the computed values from the CPU to
the decoder driver.
The former is called "I bus (Input bus)" and the
latter "0 bus (Output bus)". The bus line system is
also made use of when the following listed information