C508_01 Datasheet, PDF (159/267 Pages) Infineon Technologies AG – 8-Bit CMOS Microcontroller

C508
On-Chip Peripheral Components
6.3.4.4 Compare Timer 1 Controlled Multi-Channel PWM Modes
Using the multi-channel PWM modes of the C508, several Compare Timer 1 controlled
PWM waveforms can be generated:
– 4-phase multi-channel PWM waveforms
– 5-phase multi-channel PWM waveforms
– 6-phase multi-channel PWM waveforms
The basic waveforms of these three Compare Timer 1 controlled PWM modes are
shown in the following three figures, Figure 6-37 to Figure 6-39. The figures show
waveforms for different COINI values with the resulting active/inactive phases and rotate
right / rotate left condition. All three figures assume that Compare Timer 1 operates with
100% duty cycle (compare and offset registers = 0000_H) and without Compare Timer 2
modulation. Compare Timer 1 duty cycles less than 100% or Compare timer 2
modulation in the multi-channel PWM modes are shown in Figure 6-34 and Figure 6-35.
a) Timing in rotate left mode (BCM1, 0 = 1, 0) with COINI XX111111 _B
Start
Compare
Timer 1
CC0
COUT1
CC2
Low =
Active
Phase
COUT2
State No.
1234123412
b) Timing in rotate right mode (BCM1, 0 = 0, 1) with COINI XX000000 _B
Start
Compare
Timer 1
CC0
COUT1
CC2
High =
Active
Phase
COUT2
State No.
2143214321
MCT02612
Figure 6-37 Basic Compare Timer 1 Controlled 4-Phase PWM Timing
User’s Manual
6-94
2001-05