參數(shù)資料
型號: PCA84C646
廠商: NXP Semiconductors N.V.
英文描述: Microcontrollers for TV tuning control and OSD applications(應(yīng)用于TV調(diào)頻和OSD的微控制器)
中文描述: 微控制器的控制和調(diào)整(應(yīng)用于電視調(diào)頻和OSD的微控制器應(yīng)用的電視OSD)
文件頁數(shù): 12/72頁
文件大小: 564K
代理商: PCA84C646
1995 Jun 15
12
Philips Semiconductors
Preliminary specification
Microcontrollers for TV tuning
control and OSD applications
PCA84C646; PCA84C846
Fig.7 Latching VSTH, VSTL into VSTREG.
t
VSTH
VSTL
VSTH
VSTL
VSTH,VSTL is loaded into VSTREG
VSTH,VSTL is loaded into VSTREG
VSTL
CASE 3
CASE 2
CASE 1
VSTH,VSTL is loaded
into VSTREG
VSTH
MED180
sub
t
sub
t
sub
t
sub
t
sub
t
sub
t
sub
t
sub
t
sub
In CASE 1 and CASE 2, a new value for VSTH, VSTL is latched into VSTREG.
In CASE 3, VSTL, together with an old value of VSTH are latched into VSTREG.
Fig.8 TDAC output (not inverted) with coarse adjustment only; VSTL = 1111111; P14LVL = 0.
handbook, full pagewidth
127
m
m + 2
127
1
00
01
m
127
decimal value VSTH data latch
MGC573
fxtal
3
tsubn
3/fxtal
0
1
(1)
(1)
(1)
2
m + 1
0
(1)
t
s
--VSTH
1
+
)
3
×
f
xtal
=
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