Service manual

QT-CD250H/W
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IC802 VHiTC9457F2-1: Servo/Signal Control (TC9457F2) (1/4)
1* (OT5)S1 SEG1 Output Segment signal output to the LCD panel.
2 (OT6)S2 SEG2 Output Up to 72 segments in a matrix with COM1 to COM4 can be displayed.
3 (OT7)S3 SEG3 Output All of the S1 to S18 pins can be switched for output ports by a program.
4 (OT8)S4 SEG4 Output Also, the S15 to S18 pins each can be switched for I/O ports individually.
5 (OT9)S5 SEG5 Output When set for I/O ports, these pins become Nch open-drain output.
6* (OT10)S6 SEG6 Output Furthermore, the S11 to S14 and the P8-0 to P8-3 pins can be switched for
7* (OT11)S7 SEG7 Output use as CD signal (CLCK to IPF) input/output pins by a program.
8* (OT12)S8 SEG8 Output • CLCK: Subcodes P thru W data readout clock input/output.
9* (OT13)S9 SEG9 Output Selected between input and output by a command.
10* (OT14)S10 SEG10 Output • DATA: Subcodes P thru W data output.
11*
(CLCK/OT15) SEG11 Output • SFSY: Playback system frame sync signal output.
S11 • LRCK: Channel clock (44.1kHz) output.
12*
(DATA/OT16) SEG12 Output It outputs a low for L channel and a high for R channel.
S12 Polarity can be inverted by a command.
13*
(SFSY/OT17) SEG13 Output • BCK : Bit clock (1.4122MHz) output.
S13 • AOUT: Audio data output.
14*
(LRCK/OT18) SEG14 Output • MBOV: Buffer memory-over signal output.
S14 It outputs a high when buffer overflows.
15 (BCK/S15) SEG15 Output • IPF : Correction flag output. When AOUT is C2 correction output, it
P8-0 outputs a high indicating that correction is impossible.
16 (AOUT/S16) SEG16 Output
P8-1
17 (MBOV/S17) NC Output
P8-2
18 (IPF/S18) NC Output
P8-3
19 MVDD MVDD1 Input/Output Power supply pins.
20 MVSS MVSS1 Input/Output Normally, apply a voltage of 4.5 to 5.5V to VDD.
In a backup state (when the CKSTP instruction executed), the device's
current consumption is reduced to 1µA or less, allowing for the supply
voltage to be lowered to 2.0V.
The device is reset and the program starts from address 0 when a voltage
of 2.7V or more is applied to this pin when it is at 0V (power-on reset).
21* (K0)P1-0 CD-FUNC Input 4-bit CMOS I/O ports.
22* (K1)P1-1 TUNER-FUNC Input These ports can be set for input or output bit for bit by a program.
23 (K2)P1-2 DOOR IN Input These pins can be pulled up to VDD or down to GND by program.
24 (K3)P1-3 PU IN Input Therefore, they can be used as key input pins. Also, when they are set for
I/O port, a change of state in this input can be used to clear the clock stop
or wait mode.
25 (DCREF)P3-0 CD POWER Output 5-bit CMOS I/O ports.
26 (ADin1)P3-1 KEY 1 Input These ports can be set for input or output bit for bit by a program.
27 (ADin2)P3-2 KEY 2 Input The P3-0 to P4-0 pins serve dual purposes as analog inputs for the internal
28 (ADin3)P3-3 ADIN 3 Input 6-bit 4-channel A/D converters.
29 (BUZR/ NC Input The internal A/D converters can complete conversion in 6 instruction cycles
ADin4)P4-0 using a successive approximation method. The required pins can be set for
A/D analog input bit for bit by a program. P3-0 can be set for reference
voltage input, and the internal power supply (MVDD) can be used for this
reference voltage.
The P4-0 pin serves dual purposes as a buzzer output pin.
The buzzer output can be selected from 8 frequencies, 0.625 to 3kHz.
Each selected frequency can be output in one of four modes: continuous,
single, 10Hz intermittent, and 10Hz intermittent at 1Hz interval.
Whether or not to use and how to control the A/D converter and buzzer all
can be set by a prograam.
Port Name
Terminal Name
Pin No.
Input/Output
In this unit, the terminal with asterisk mark (*) is (open) terminal which is not connected to the outside.
Function