MC68HC05RC17 Datasheet, PDF (69/128 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
General Release Specification — MC68HC05RC17
Section 9. Carrier Modulator Transmitter (CMT)
9.1 Contents
9.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .69
9.3 Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70
9.4 Carrier Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .72
9.4.1 Time Counter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73
9.4.2 Carrier Generator Data Registers . . . . . . . . . . . . . . . . . . . .74
9.5 Modulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .76
9.5.1 Time Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .77
9.5.2 FSK Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
9.5.3 Extended Space Operation . . . . . . . . . . . . . . . . . . . . . . . . .80
9.5.3.1 End-of-Cycle (EOC) Interrupt. . . . . . . . . . . . . . . . . . . . . .81
9.5.3.2 Modulator Control and Status Register . . . . . . . . . . . . . .82
9.5.4 Modulator Period Data Registers . . . . . . . . . . . . . . . . . . . .85
9.2 Introduction
The carrier modulator transmitter (CMT) module provides a means to
generate the protocol timing and carrier signals for a wide variety of
encoding schemes. It incorporates hardware to off-load the critical
and/or lengthy timing requirements associated with code generation
from the CPU, releasing much of its bandwidth to handle other tasks
such as code data generation, data decompression, or keyboard
scanning. The CMT does not include dedicated hardware configurations
for specific protocols but is intended to be sufficiently programmable in
its function to handle the timing requirements of most protocols with
MC68HC05RC17 — Rev. 2.0
General Release Specification
Carrier Modulator Transmitter (CMT)
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