PC912XDP512F0CFVR datasheet(480/1348 Pages) FREESCALE

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Chapter 11 Serial Communication Interface (S12SCIV5)

MC9S12XDP512 Data Sheet, Rev. 2.21

480

Freescale Semiconductor

11.2

External Signal Description

The SCI module has a total of two external pins.

11.2.1

TXD — Transmit Pin

The TXD pin transmits SCI (standard or infrared) data. It will idle high in either mode and is high

impedance anytime the transmitter is disabled.

11.2.2

RXD — Receive Pin

The RXD pin receives SCI (standard or infrared) data. An idle line is detected as a line high. This input is

ignored when the receiver is disabled and should be terminated to a known voltage.

11.3

Memory Map and Register Deﬁnition

This section provides a detailed description of all the SCI registers.

11.3.1

Module Memory Map and Register Deﬁnition

The memory map for the SCI module is given below in Figure 11-2. The address listed for each register is

the address offset. The total address for each register is the sum of the base address for the SCI module and

the address offset for each register.

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