Section iii: channel selection circuit, Outline of channel selection circuit system, Operation of channel selection circuit – Toshiba TW40F80 User Manual
Page 18: Microcomputer
18
Fig. 3-1
3. MICROCOMPUTER
Microcomputer TMP87CS38N-3320 has 60k byte of ROM
capacity and equipped with OSD function inside.
The specification is as follow.
•
Type name : TMP87CS38N-3320
•
ROM : 60k byte
•
RAM : 2k byte
•
Processing speed : 0.5
m
s (at 8MHz with Shortest com-
mand)
•
Package : 42 pin shrink DIP
•
I
2
C-BUS : two channels
•
PWM : 14 bit
x
1, 7 bit
x
9
•
ADC : 8 bit x 6 (Successive comparison system, Conver-
sion time 20
m
s)
IIC device controls through I
2
C bus. (Timing chart : See Fig.
3-1)
•
LED uses big current port for output only.
•
For clock oscillation, 8MHz ceramic oscillator is used.
•
I
2
C has two channels. One is for EPROM only.
•
Self diagnosis function which utilizes ACK function of
I
2
C is equipped
•
Function indication is added to service mode.
•
Remote control operation is equipped, and the control
by set no touch is possible. (Bus connector in the con-
ventional bus chassis is deleted.)
•
Substantial self diagnosis function
(1) B/W composite video signal generating function
(micom inside, green crossbar added)
(2) Generating function of audio signal equivalent to
1kHz (micom inside)
(3) Detecting function of power protection circuit opera-
tion
(4) Detecting function of abnormality in IIC bus line
(5) Functions of LED blink indication and OSD indica-
tion
(6) Block diagnosis function which uses new VCD and
AV SW
SDA
SCL
1 - 7
8
9
1 - 7
8
9
1 - 7
8
9
Start
condition
Stop
condition
Address
R/W
Ack
Data
Ack
DATA
Ack
Approx.180
µ
S
Some device may have no data,
or may have data with several
bytes continuing.