SN28835

1/2-INCH NTSC TIMER

SOCS023B – FEBRUARY 1991

14

POST OFFICE BOX 655303

PARAMETER MEASUREMENT INFORMATION

VD

GP

PI

PS,T

GT

ABIN

BCP1, BCP2

Mode

Operation

Variable-Integration-Time

(see Note B)

256 Pulses

(see Note A)

244 Pulses

Operation

GPS

Normal Operation

See Note C

Figure 10. Timing – Normal Operation Versus Variable-Integration-Time Operation

NOTES: A. When VD is low and GP level changes from high to low, 244 pulses are generated on PI, PS, and T.

B. When GP goes low, 256 pulses are generated on PI, PS, and T.

C. Depending on the shutter design, GPS can either be held low or clocked during variable-integration-mode operation.

If GPS is clocked, VD follows GP during the intervals in which GPS is high.