Closed-Caption Decoder
Functional Description
Panasonic Semiconductor Development Company
MN102H75K/F75K/85K/F85K LSI User Manual
230
Panasonic
Table 9-5 provides the registers used to control and monitor the clamping circuit.
See the page number indicated for register and bit descriptions.
9.3.3
Sync Separator Circuit
A low-pass filter and a sync separator comprise this block. The sync separator
extracts HSYNC and VSYNC from the composite video signal. Figure 9-6 shows
a block diagram of the circuit, and table 9-6 provides the registers used to control
and monitor it. See the page number indicated for register and bit descriptions.
Table 9-4 Current Level Control
Control
Conditions
Current Source
Low Current
Medium Current
High Current
(1)
(2)
(3)
(4)
(5)
(6)
10
≤
A
Off
On
Off
On
Off
On
4
≤
A
≤
9
Off
On
Off
On
Off
Off
1
≤
A
≤
3
Off
On
Off
Off
Off
Off
A= 0
Off
Off
Off
Off
Off
Off
-3
≤
A
≤
-1
On
Off
Off
Off
Off
Off
-9
≤
A
≤
-4
On
Off
On
Off
Off
Off
A
≤
-10
On
Off
On
Off
On
Off
Notes:
1. A = compare level - reference level
2. The numbers (1) to (6) correspond to the same number in figure 9-5.
Table 9-5 Control Registers for Clamping Circuit
Register
Page
CCDO
Address
CCD1
Address
Description
Register for selecting the low-pass filter
NFSEL
242
x’007EC0’
x’007EE0’
Noise filter select register
Registers for controlling clamping
SCMING
243
x’007EC4’
x’007EE4’
Minimum sync level detection interval set
register
SYNCMIN
244
x’007EC8’
x’007EE8’
Sync and pedestal level register
BPPST
243
x’007EC6’
x’007EE6’
Backporch position register
CLAMP
245
x’007ECC’
x’007EEC
’
Clamping control register
CLPCND
1
248
x’007EDC’
x’007EEC
’
Clamping control signal status register 1
Содержание MN10285K
Страница 1: ...MICROCOMPUTER MN102H MN102H75K F75K 85K F85K LSI User s Manual Pub No 22385 011E ...
Страница 2: ......
Страница 316: ...Register Map MN102H75K F75K 85K F85K LSI User Manual Panasonic Semiconductor Development Company 315 Panasonic ...
Страница 336: ......