MC9S08RG60 Datasheet, PDF (94/232 Pages) Motorola, Inc – Microcontrollers

Carrier Modulator Transmitter (CMT) Module
7.2 Features
The CMT consists of a carrier generator, modulator, and transmitter that drives the infrared out (IRO) pin.
The features of this module include:
• Four modes of operation
– Time with independent control of high and low times
– Baseband
– Frequency shift key (FSK)
– Direct software control of IRO pin
• Extended space operation in time, baseband, and FSK modes
• Selectable input clock divide: 1, 2, 4, or 8
• Interrupt on end of cycle
– Ability to disable IRO pin and use as timer interrupt
7.3 CMT Block Diagram
PRIMARY/SECONDARY SELECT
MODULATOR
CLOCK
CONTROL
CMTCLK
CARRIER
GENERATOR
CARRIER
OUT (f_CG)
MODULATOR
OUT
TRANSMITTER
OUTPUT
IRO
PIN
CMTDIV
CMT REGISTERS
AND BUS INTERFACE
BUS CLOCK
INTERNAL BUS
IIREQ
Figure 7-2 Carrier Modulator Transmitter Module Block Diagram
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MC9S08RC/RD/RE/RG
Freescale Semiconductor