MC68HC908LK24 MOTOROLA [Motorola, Inc], MC68HC908LK24 Datasheet - Page 250
MC68HC908LK24
Manufacturer Part Number
MC68HC908LK24
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908LK24.pdf
(465 pages)
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Infrared Serial Communications
13.6 Infrared Functional Description
Data Sheet
250
NOTE:
Infrared Serial Communications Interface Module (IRSCI)
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.
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.
Figure 13-3
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_R32XCLK
SCI_R16XCLK
Freescale Semiconductor, Inc.
SCI_RxD
SCI_TxD
For More Information On This Product,
Go to: www.freescale.com
shows the structure of the infrared sub-module.
Figure 13-3. Infrared Sub-Module Diagram
MUX
IR_RxD
TNP[1:0]
TRANSMIT
ENCODER
DECODER
RECEIVE
MC68HC908LJ24/LK24 — Rev. 2
IR_TxD
IREN
MUX
MOTOROLA
RxD
TxD
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