參數(shù)資料
型號: SDA 5255
廠商: SIEMENS AG
英文描述: TVTEXT 8-Bit Microcontroller(ROM-Versions )(TV視頻的8位微控制器(含ROM 型 ))
中文描述: TVTEXT 8位微控制器(ROM的版本)(電視視頻的8位微控制器(含光盤型))
文件頁數(shù): 33/143頁
文件大?。?/td> 1050K
代理商: SDA 5255
SDA 525x
Semiconductor Group
33
1998-04-08
6.2.10
To fit the requirements of various applications the input circuit of the sandcastle decoder
is programmable. Both slicing levels (
V
SCH
,
V
SCL2
) which are important for proper SC-
decoder function can be varied in a range of about 0.9 V and in addition there is the
possibility to increase the implemented hysteresis by 0.3 V typically. Further noise
reduction and spike rejection on pin SC is accomplished by using a digital filter following
the input circuitry. See
Figure
41
on
page 133
for further information on
V
SCH
and
V
SCL2
.
Sandcastle Decoder
Sandcastle Control Register SCCON
Sandcastle Control Register
Default after reset: 00
H
(MSB)
0
SCCH.2
SCCON
SFR-Address CE
H
(LSB)
SCCL.0
SCCH.1
SCCH.0
0
SCCL.2
SCCL.1
SCCL1...0
00 = set
V
SCL2
to lowest level (1.0 V typ.)
01 = increase
V
SCL2
by 0.3 V (typ.)
10 = increase
V
SCL2
by 0.6 V (typ.)
11 = increase
V
SCL2
by 0.9 V (typ.)
SCL.2
0 = hysteresis
V
SCL2
set to 0.3 V (typ.)
1 = increase hysteresis
V
SCL2
by 0.6 V (typ.)
SCCH1...0
00 = set
V
SCH
to lowest level 3.0 V (typ.)
01 = increase
V
SCH
by 0.3 V (typ.)
10 = increase
V
SCH
by 0.6 V (typ.)
11 = increase
V
SCH
by 0.9 V (typ.)
SCCH.2
0 = hysteresis
V
SCH
set to 0.3 V (typ.)
1 = increase hysteresis
V
SCH
by 0.6 V
Attention
Bits 3 and 7 have to be set to ‘0’.
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