
W78C354
Publication Release Date: October 1996
- 29 -
Revision A1
In the following table, in the positions marked with an "
¤
" one clock pulse will be added to every 16
PWM outputs.
SBRM0,
SBRM1
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
PWM/BRM OUTPUT CYCLE
5
6
7
-
-
-
-
-
-
-
-
-
-
-
-
-
¤
-
-
¤
-
-
¤
-
-
¤
-
-
¤
-
¤
-
¤
-
¤
0
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
-
-
-
-
-
-
-
2
-
-
-
-
3
-
-
-
-
-
-
-
-
4
-
-
8
-
9
-
-
-
-
-
-
-
-
10
-
-
-
-
11
-
-
-
-
-
-
-
-
12
-
-
13
-
-
-
-
-
-
-
-
14
-
-
-
-
15
-
-
-
-
-
-
-
-
¤
-
¤
¤
¤
-
-
¤
-
¤
-
-
¤
¤
¤
¤
¤
-
¤
¤
¤
¤
¤
¤
¤
¤
-
-
-
-
¤
-
-
¤
-
¤
-
-
-
-
¤
-
-
¤
-
-
-
-
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
-
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
-
-
¤
¤
-
¤
¤
¤
-
-
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
-
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
¤
L-2. Three-channel 8-bit and One-channel 12-bit PWM Dynamic DACs
The 8-bit PWM dynamic DACs (DDAC0-2) and 12-bit PWM dynamic DAC (BDDAC) are used to
achieve geometric compensation by generating a parabola output waveform by the integrator circuit
shown in Figure 6 and by executing the "MOV DDACn, #value," "MOV BDDAC, #value," or "MOV
DBRM, #value" instructions by a software program. The PWM waveforms and operating criteria of
the related registers are similar to those of the static DACs. The unused dynamic DACs can be used
as static DACs.
W78C354
8/12 bit DDAC
2.5 V
V
output
R
C
Figure 10. Dynamic DAC application circuit