PC912XDP512F0MPVR datasheet(494/1348 Pages) FREESCALE

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Chapter 11 Serial Communication Interface (S12SCIV5)

MC9S12XDP512 Data Sheet, Rev. 2.21

494

Freescale Semiconductor

11.4.1

Infrared Interface Submodule

This module provides the capability of transmitting narrow pulses to an IR LED and receiving narrow

pulses and transforming them to serial bits, which are sent to the SCI. The IrDA physical layer

speciﬁcation deﬁnes a half-duplex infrared communication link for exchange data. The full standard

includes data rates up to 16 Mbits/s. This design covers only data rates between 2.4 Kbits/s and 115.2

Kbits/s.

The infrared submodule consists of two major blocks: the transmit encoder and the receive decoder. The

SCI transmits serial bits of data which are encoded by the infrared submodule to transmit a narrow pulse

for every zero bit. No pulse is transmitted for every one bit. When receiving data, the IR pulses should be

detected using an IR photo diode and transformed to CMOS levels by the IR receive decoder (external

from the MCU). The narrow pulses are then stretched by the infrared submodule to get back to a serial bit

stream to be received by the SCI.The polarity of transmitted pulses and expected receive pulses can be

inverted so that a direct connection can be made to external IrDA transceiver modules that uses active low

pulses.

The infrared submodule receives its clock sources from the SCI. One of these two clocks are selected in

the infrared submodule in order to generate either 3/16, 1/16, 1/32 or 1/4 narrow pulses during

transmission. The infrared block receives two clock sources from the SCI, R16XCLK and R32XCLK,

which are conﬁgured to generate the narrow pulse width during transmission. The R16XCLK and

R32XCLK are internal clocks with frequencies 16 and 32 times the baud rate respectively. Both

R16XCLK and R32XCLK clocks are used for transmitting data. The receive decoder uses only the

R16XCLK clock.

11.4.1.1

Infrared Transmit Encoder

The infrared transmit encoder converts serial bits of data from transmit shift register to the TXD pin. A

narrow pulse is transmitted for a zero bit and no pulse for a one bit. The narrow pulse is sent in the middle

of the bit with a duration of 1/32, 1/16, 3/16 or 1/4 of a bit time. A narrow high pulse is transmitted for a

zero bit when TXPOL is cleared, while a narrow low pulse is transmitted for a zero bit when TXPOL is set.

11.4.1.2

Infrared Receive Decoder

The infrared receive block converts data from the RXD pin to the receive shift register. A narrow pulse is

expected for each zero received and no pulse is expected for each one received. A narrow high pulse is

expected for a zero bit when RXPOL is cleared, while a narrow low pulse is expected for a zero bit when

RXPOL is set. This receive decoder meets the edge jitter requirement as deﬁned by the IrDA serial infrared

physical layer speciﬁcation.

11.4.2

LIN Support

This module provides some basic support for the LIN protocol. At ﬁrst this is a break detect circuitry

making it easier for the LIN software to distinguish a break character from an incoming data stream. As a

further addition is supports a collision detection at the bit level as well as cancelling pending transmissions.

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