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6. CPU CIRCUIT

1) CPU

IC801: 8 bit CPU / CMOS IC

IC802: EEPROM / CMOS IC

IC571: I/O Expander

This system has the following functions.

Frequency Counter

C BUS control

fH band

Degaussing Control

DAC control (see 2. DC Control Circuit)

PMS control (see 3. Power Management system (PMS) Circuit )

OSD control (see 5. User Control Operation)

a. Frequency Counter

IC801 counts Horizontal frequency by event counter, Vertical frequency by interval timer. Horizontal sync

is negative input to IC801 pin 4. Vertical sync is positive input to IC801 pin 36.

Sync range

Horizontal 31.0 - 130.0 kHz

Vertical 55.0 - 160 Hz

If Horizontal frequency is less than 1 kHz or Vertical frequency is less than 10 Hz, IC801 judges “NO

PULSE”. And IC801 enters to “PMS MODE”.

b. I

C BUS control

CPU (IC801) controls the following ICs through I

C BUS.

DAC IC751(M62393FP)、IC532(M62392FP)

PREAMP IC711(M52742ASP)

PROM IC802(24LC08,M24C08) 、IC8A1(24LCS21A)

I/O EXPANDER IC571(M62320FP)

OSC IC(DSP) IC501(HE6-0092)

OSD IC IC791(M35070-050FP)

SUB CPU IC851(MC68HC705BD32FU)

AUTO SIZE IC IC8M1(BU6483K)

CONVERGENCE IC IC8U1(uPD93299GD)

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Caple C702G Wartungshandbuch Seite 147