HC05RC17GRSSLASHD datasheet(71/128 Pages) NXP

71 / 128 page

Carrier Modulator Transmitter (CMT)

Overview

MC68HC05RC17 — Rev. 2.0

General Release Specification

Carrier Modulator Transmitter (CMT)

Figure 9-1. Carrier Modulator Transmitter Module Block Diagram

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

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

HC05RC17GRS/D 데이터시트(PDF) 71 Page - NXP Semiconductors