MC68HC908AP16CFB datasheet(253/440 Pages) MOTOROLA

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Infrared Serial Communications Interface Module (IRSCI)

Infrared Functional Description

MC68HC908AP Family — Rev. 2.5

Data Sheet

MOTOROLA

253

The infrared sub-module receives two clock sources from the SCI

module: SCI_R16XCLK and SCI_R32XCLK. Both reference clocks are

used to generate the narrow pulses during data transmission.

The SCI_R16XCLK and SCI_R32XCLK are internal clocks with

frequencies that are 16 and 32 times the baud rate respectively. Both

SCI_R16XCLK and SCI_R32XCLK clocks are used for transmitting

data. The SCI_R16XCLK clock is used only for receiving data.

NOTE:

For proper SCI function (transmit or receive), the bus clock MUST be

programmed to at least 32 times that of the selected baud rate.

When the infrared sub-module is disabled, signals on the TxD and RxD

pins pass through unchanged to the SCI module.

14.5 Infrared Functional Description

Figure 14-3 shows the structure of the infrared sub-module.

Figure 14-3. Infrared Sub-Module Diagram

The infrared sub-module provides the capability of transmitting narrow

pulses to an infrared LED and receiving narrow pulses and transforming

them to serial bits, which are sent to the SCI module. The infrared sub-

module receives two clocks from the SCI. One of these two clocks is

selected as the base clock to generate the 3/16, 1/16, or 1/32 bit width

narrow pulses during transmission.

SCI_R16XCLK

TRANSMIT

ENCODER

RECEIVE

DECODER

MUX

SCTxD

SCRxD

IR_TxD

TNP[1:0]

SCI_TxD

IR_RxD

SCI_RxD

IREN

SCI_R32XCLK

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

MC68HC908AP16CFB Datasheet(PDF) 253 Page - Motorola, Inc

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