SN28835

1/2-INCH NTSC TIMER

SOCS023B – FEBRUARY 1991

15

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

Operation of VCR

CSYNC

VCR

Internal

Vertical

Counter

(see Note A)

10

9

8

7

6

CSYNC

HCR

Horizontal

Scale†

Operation of HCR

17

15

13

11

9

7

5

3

Equalization Pulses

Figure 11. Horizontal and Vertical Reset Timing

† 130 intervals equals 63.55

µs equals one horizontal-scan line

NOTE A: The internal vertical counter is preset to the value 6 (indicating the end of vertical sync) when VCR transitions from low to high.

Immediately following the low-to-high transition on VCR, horizontal scanning commences on line 7 of the frame.

SC(90)

SC

Figure 12. SC and SC(90) Timing