bt829bkrf ETC-unknow, bt829bkrf Datasheet - Page 106

• Manufacturer Part Number: bt829bkrf
• Description: Video Streamii Decoders
• Manufacturer: ETC-unknow

96
4.0 Control Register Definitions
0x14—Vertical Scaling Register, Lower Byte (VSCALE_LO)
0x14—Vertical Scaling Register, Lower Byte (VSCALE_LO)
This control register may be written to or read by the MPU at any time. Upon reset, it is initialized to 0x00.
VSCALE_LO
0x15—Test Control Register (TEST)
This control register is reserved for putting the part into test mode. Write operation to this register may cause
undetermined behavior and should not be attempted. A read cycle from this register returns 0x01, and only a
write of 0x01 is permitted.
7
0
Vertical Scaling Ratio—These eight bits represent the LSbyte of the 13-bit vertical scaling
ratio register. They are concatenated with 5 bits in VSCALE_HI. The following equation is
used to determine the value for this register:
lines is 156:
For example, to scale PAL/SECAM input to square pixel QCIF, the total number of vertical
6
0
VSCALE = ( 0x10000 – { [ ( scaling_ratio ) – 1] * 512 } ) & 0x1FFF
VSCALE = ( 0x10000 – { [ ( 4/1 ) –1 ] * 512 } ) & 0x1FFF
5
0
= 0x1A00
4
0
D829BDSA
VSCALE_LO
3
0
2
0
VideoStream II Decoders
1
0
Bt829B
0
0