35

Frame_Period_Min_Bound_Lower

Address: 0x1B

Access: Read/Write

Reset Value: 0xAC (before SROM download)

0x7E (after SROM download)

Frame_Period_Min_Bound_Upper

Address: 0x1C

Access: Read/Write

Reset Value: 0x0D (before SROM download)

0x0E (after SROM download)

Bit

7

6

5

4

3

2

1

0

Field

Data Type: 16-bit unsigned integer.

USAGE: This value sets the minimum frame period (the MAXIMUM frame rate) that may be selected by the automatic

frame rate control. Units are clock cycles. The formula is

Frame Rate = Clock Rate / Register value

To read from the registers, read Upper first followed by Lower. To write to the registers, write Lower first, followed by

Upper, then execute a write to the Frame_Period_Max_Bound_Upper and Lower registers. The minimum allowed write

value is 0x7E0E; the maximum is 0xFFFF.

Reading this register will return the most recent value that was written to it. However, the value will take effect only

after a write to the Frame_Period_Max_Bound_Upper and Lower registers. After writing to Frame_Period_Max_

Bound_Upper, wait at least two frame times before writing to Frame_Period_Min_Bound_Upper or Lower again. The

“Busy” bit in the Extended_Config register may be used in lieu of a timer to determine when it is safe to write. See the

Extended_Config register for more details.

In addition, the three bound registers must also follow this rule when set to non-default values:

Frame_Period_Max_Bound ≥ Frame_Period_Min_Bound + Shutter_Max_Bound.

Bit

7654

32

1

0

Field

All rights strictly reserved any portion in this paper shall not be reproduced, copied or transformed to any other forms without permission.

PixArt Imaging Inc.

PixArt Imaging Inc.