PIC16C711-20/SO【PDF 75/177 页】IC MCU OTP 1KX14 A/D 18SOIC

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166

7593L–AVR–09/12

AT90USB64/128

17. Output Compare Modulator (OCM1C0A)

17.1

Overview

The Output Compare Modulator (OCM) allows generation of waveforms modulated with a carrier

frequency. The modulator uses the outputs from the Output Compare Unit C of the 16-bit

Timer/Counter1 and the Output Compare Unit of the 8-bit Timer/Counter0. For more details

about these Timer/Counters see “Timer/Counter0, Timer/Counter1, and Timer/Counter3 pres-

calers” on page 96 and “8-bit Timer/Counter2 with PWM and asynchronous operation” on page

145.

Figure 17-1. Output Compare Modulator, block diagram.

When the modulator is enabled, the two output compare channels are modulated together as

shown in the block diagram (Figure 17-1).

17.2

Description

The Output Compare unit 1C and Output Compare unit 2 shares the PB7 port pin for output. The

outputs of the Output Compare units (OC1C and OC0A) overrides the normal PORTB7 Register

when one of them is enabled (that is, when COMnx1:0 is not equal to zero). When both OC1C

and OC0A are enabled at the same time, the modulator is automatically enabled.

The functional equivalent schematic of the modulator is shown on Figure 17-2. The schematic

includes part of the Timer/Counter units and the port B pin 7 output driver circuit.

Figure 17-2. Output Compare Modulator, schematic.

OC1C

Pin

OC1C /

OC0A / PB7

Timer/Counter 1

Timer/Counter 0

OC0A

PORTB7

DDRB7

Pin

COMA01

COMA00

DATABUS

OC1C /

OC0A/ PB7

COM1C1

COM1C0

Modulator

OC1C

OC0A

(From Waveform generator)

Vcc

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