HC705RC16GRSSLASHD datasheet(67/120 Pages) NXP

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Carrier Modulator Transmitter (CMT)

Overview

MC68HC705RC16 — Rev. 3.0

General Release Specification

Carrier Modulator Transmitter (CMT)

Figure 9-1. Carrier Modulator Transmitter Module Block Diagram

The modulator provides a simple method to control protocol timing. The

modulator has a resolution of 4

µs with a 2-MHz oscillator. It can count

system clocks to provide real-time control or it can count carrier clocks

for self-clocked protocols. It can either gate the carrier onto the

modulator output (TIME), control the logic level of the modulator output

(baseband) or directly route the carrier to the modulator output while

providing a signal to switch the carrier generator between high/low time

The transmitter output block controls the state of the infrared out pin

(IRO). The modulator output is gated on to the IRO pin when the

modulator/carrier generator is enabled. Otherwise, the IRO pin is

controlled by the state of the IRO latch, which is directly accessible to the

CPU by means of bit 7 of the carrier generator data registers CHR1 and

CLR1. The IRO latch can be written to on either edge of the internal bus

clock (fosc/2), allowing for IR waveforms which have a resolution of twice

the bus clock frequency (fosc). See 9.4.2 Carrier Generator Data

Registers (CHR1, CLR1, CHR2, and CLR2).

fOSC

CARRIER

GENERATOR

MODULATOR

CARRIER

OUT

MODULATOR

OUT

MODULATOR/

TRANSMITTER

OUTPUT

BASE

MODE

PRIMARY/SECONDARY SELECT

CPU INTERFACE

IRO

fOSC ÷ 2

EOC INTERRUPT

CARRIER

ENABLE

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

HC705RC16GRS/D Datasheet(PDF) 67 Page - NXP Semiconductors

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