Toshiba CF35E50, Technical Training Manual

Page: 26 / 139

26
3. MICROCOMPUTER
Microcomputer TMP87CS38N-3152 has 60k byte of ROM
capacity and equipped with OSD function inside.
The specification is as follow.
• Type name : TMP87CS38N-3152
• ROM : 60k byte
• RAM : 2k byte
• Processing speed : 0.5
m
s (at 8MHz with Shortest
command)
• Package : 42 pin shrink DIP
• I2C-BUS : two channels
• PWM : 14 bit x 1, 7 bit x 9
• ADC : 8 bit x 6 (Successive comparison system,
Conversion time 20
m
s)
• OSD
Character kinds : 256
Character display : 24 characters x 12 lines
Character dot
: 14 x 18 dots
Character size : 3 kinds (Selected by line)
Character color : 8 colors (Selected by character)
Display position : Horizontal 128 steps, Vertical
256 steps
This microcomputer performs functions of AD converter,
reception of U/V TV and OSD display in one chip.
IIC device controls through I2C bus. (Timing chart : See fig.
3-1)
• LED uses big current port for output only.
• For clock oscillation, 8MHz ceramic oscillator is used.
• I2C has two channels. One is for EPROM only.
• Self diagnosis function which utilizes ACK function of
I2C 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
conventional 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
operation
(4) Detecting function of abnormality in IIC bus
line
(5) Functions of LED blink indication and OSD
indication
(6) Block diagnosis function which uses new VCD
and AV SW
Fig. 3-1
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
m
S
Some device may have no data,
or may have data with several
bytes continuing.