C508 datasheet(40/93 Pages) INFINEON

40 / 93 page

C508

Data Sheet

2000-08

Compare (COMP) Unit Operation

The Capture/Compare Unit CCU of the C508 also provides a 10-bit Compare Unit

(COMP) which operates as a single channel pulse generator with a pulse width

modulated output signal. This output signal is available at the output pin COUT3 of the

C508. In the combined multi-channel PWM modes and in burst mode of the CAPCOM

unit the output signal of the COMP unit can also be switched to the output signals COUTx

or CCx. Figure 16 shows the block diagram and the pulse generation scheme of the

COMP unit.

Figure 16

COMP Unit: Block Diagram and Pulse Generation Scheme

The COMP unit has a 10-bit up-counter (Compare Timer 2, CT2) which starts counting

from 000H up to the value stored in the period register and then is again reset. This

Compare Timer 2 operation is equal to the operating mode 0 of Compare Timer 1. When

the count value of CT2 matches the value stored in the compare registers CMP2H/

CMP2L, COUT3 toggles its logic state. When Compare Timer 2 is reset to 000H, COUT3

toggles again its logic state.

In the combined multi-channel PWM modes and in the burst mode, the Compare Timer 2

output signal can also be switched to the CAPCOM output pins COUT0, COUT1, and

COUT3. In these modes, the polarity of the modulated output signal at COUT2-0 can be

inverted by setting bit COUTXI (COINI.6)

Combined Multi-Channel PWM Modes

The CCU of the C508 has been designed to support also motor control or inverter

applications which have a demand for specific multi-channel PWM signal generation. In

these combined multi-channel PWM modes the CAPCOM unit (Compare Timer 1) and

the COMP unit (Compare Timer 2) of the C508 CCU are working together.

MCB04101

Programmable

Prescaler

Period Registers

CP2H/CP2L

Compare Timer 2

10-Bit Up Counter

Control Register

CT2CON

Comparator

Compare Registers

CMP2H/CMP2L

Pulse

Generation

Match

Port

COUT3

COUTXI

(COINI.6)

COUT3I

(COINI.7)

OSC

ECT20

To CAPCOM

Output Control

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