Philips Semiconductors
Microcontrollers for TV tuning
control and OSD applications
Preliminary specification
PCA84C646; PCA84C846
handbook, full pagewidth
f PWM = fxtal
3
6 or 7-BIT PWM DATA LATCH
P6LVL/P7LVL
(1-BIT)
DP0n data
I/O
PWMnE
Q
6 or 7-BIT DAC PWM
CONTROLLER
Q
DP0n/PWM0n
MED177
Fig.4 Block diagram of 6-bit or7-bit PWM DAC.
handboofk,xftuall pagewidth
3
64
1
or
128
00
2
3
01
m
63
or
127
decimal value PWM data latch
m
m+1 m+2
64
1
or
128
MLC261
1995 Jun 15
Fig.5 Example PWM0n output patterns (P6LVL/P7LVL = 0).
9