C508_01 Datasheet, PDF(132/267 Page) Infineon Technologies AG – 8-Bit CMOS Microcontroller

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C508_01 Datasheet, PDF (132/267 Pages) Infineon Technologies AG – 8-Bit CMOS Microcontroller

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C508

On-Chip Peripheral Components

Capture/Compare Channel Mode Select Registers

The capture/compare channels of the CAPCOM unit can operate individually either in

compare mode or in capture mode. The CMSEL0 and CMSEL1 registers contain the

mode select bits for the CAPCOM unit.

Special Function Register CMSEL0 (Address E3H)

Special Function Register CMSEL1 (Address E4H)

Reset Value: 00H

Reset Value: 00H

Bit No. MSB

LSB

7

6

5

4

3

2

1

0

E3H

CMSEL CMSEL CMSEL CMSEL CMSEL CMSEL CMSEL CMSEL

13

12

11

10

03

02

01

00

CMSEL0

CAPCOM

Channel 1

7

6

5

E4H ESMC NMCS 0

CAPCOM

Channel 0

4

3

2

1

0

0

CMSEL CMSEL CMSEL CMSEL

23

22

21

20

CMSEL1

CAPCOM

Channel 2

Bit

ESMC

NMCS

CMSELx3

x = 0-2

Function

Enable software controlled multi-channel PWM modes

If ESMC = 0, switching of the follower state in 4-/5-/6-phase multi-channel PWM

mode is controlled by Compare Timer 1 reaching its period value.

If ESMC = 1, switching of the follower state in 4-/5-/6-phase multi-channel PWM

mode is controlled by bit NMCS.

Next multi-channel PWM state

Setting bit NMCS (with ESMC set) will select the follower state in the

4/5/6-phase multi-channel PWM mode, which is taken into account at the output

pins, when Compare Timer 1 is 0. Bit NMCS is reset by hardware in the next clock

cycle after it has been set.

Switching Compare Timer 2 output signal to COUTx

If CMSELx3 is set and compare mode is selected for the outputs COUTx, the

output signal of the 10-bit Compare unit, typically a higher frequency signal, is

switched (modulated) to the COUTx pin. The state of the corresponding COINI bit

at the start of Compare Timer 1 defines the logic level of the CAPCOM channel

output signal at which the COMP output signal is output to COUTx.

COINI is set:

The COMP output is switched to COUTx during the low

phase of the CAPCOM channel X signal.

COINI is cleared: The COMP output is switched to COUTx during the high

phase of the CAPCOM channel X signal.

Userâs Manual

6-67

2001-05

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