Philips Semiconductors
Microcontrollers for TV tuning
control and OSD applications
Preliminary specification
PCA84C646; PCA84C846
handbook, full pagewidth
t sub0
t sub16
t sub32
t sub48
tr
t sub64
t sub80
t sub96
t sub112
t sub127
111 1110
111 1101
111 1011
111 1010
VSTL
Fig.9 Fine adjustment output (OUT2).
MCD314
handbook, full pagewidth
3/fxtal
f xtal
3
127
0
1
2
00
01
m
127
decimal value VSTH data latch
tsub16
m
m+1 m+2
127
0
1
MGC572
VSTL = 111 1010; Additional pulses in subperiods 16, 48, 64, 80 and 112.
Fig.10 Example of TDAC (not inverted) output pulses for several values of VSTH (tsub16).
1995 Jun 15
13