UPD6465CS datasheet(28/52 Pages) NEC

28 / 52 page

µPD6464A,6465

4.2

Test Mode Clear Command

The command that clears the test mode is as follows:

D15

D14

D13

D12

D11

D10

1011000000000000

Caution

Be sure to connect the TEST pin to VCC when performing the above adjustment. Be sure to

connect the TEST pin to GND after adjustment.

4.3

Clamp Level of Video Signal

Match the clamp level of the composite video signal input to the

µPD6464A, 6465 with the internal video signal

level of the

µPD6464A, 6465. Otherwise, the character level in the external video signal mode will differ from

that in the internal video signal mode.

Adjustment

The internal video signal level of the

µPD6464A, 6465 is set by the voltage applied to the VCNT pin and an

“output level control command”.

The amplitude level of the internal video signal, sync-chip level, and pedestal level can be set in the following

combination:

Specified by Output

Internal Video Signal

Sync-Chip Level

Pedestal Level

VCNT Pin Voltage

Level Control

Amplitude Level

(VDD = 5.0 typ.)

Command

(VDD = 5.0 typ.)

(VSYT)

(VPED)

2.5 V

Selects 1 Vp-p

1 Vp-p

1 V

1.29 V

5.0 V

Selects 2 Vp-p

2 Vp-p

1 V

1.58 V

Adjust the sync-chip and pedestal levels of the external video signal to the same level of the internal video signal

by using a variable resistor (pin 23) shown in 8. APPLICATION CIRCUIT DIAGRAM. When setting the video

amplitude level to 1 Vp-p, connecting a variable resistor to the VCNT pin is recommended to adjust the internal video

signal level (when setting the video signal to 2 Vp-p, connect the VCNT pin to the power supply (5 V)).

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