EVB9S12XEP100 Freescale Semiconductor, EVB9S12XEP100 Datasheet - Page 745

Manufacturer Part Number

EVB9S12XEP100

BOARD EVAL FOR MC9S12XEP100

Manufacturer

Freescale Semiconductor

Module and Misc Hardware

Processor To Be Evaluated

MC9S12XEP100

Data Bus Width

Interface Type

Silicon Manufacturer

Core Architecture

Core Sub-architecture

Silicon Core Number

Silicon Family Name

Rohs Compliant

For Use With/related Products

MC9S12XEP100

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

The SCI transmitter can accommodate either 8-bit or 9-bit data characters. The state of the M bit in SCI

control register 1 (SCICR1) determines the length of data characters. When transmitting 9-bit data, bit T8

in SCI data register high (SCIDRH) is the ninth bit (bit 8).

To transmit data, the MCU writes the data bits to the SCI data registers (SCIDRH/SCIDRL), which in turn

are transferred to the transmitter shift register. The transmit shift register then shifts a frame out through

the TXD pin, after it has prefaced them with a start bit and appended them with a stop bit. The SCI data

registers (SCIDRH and SCIDRL) are the write-only buffers between the internal data bus and the transmit

shift register.

Freescale Semiconductor

Because of an order from the United States International Trade Commission, BGA-packaged product lines and partnumbers

indicated here currently are not available from Freescale for import or sale in the United States prior to September 2010

Transmitter Character Length

Character Transmission

Baud Divider

MC9S12XE-Family Reference Manual Rev. 1.23

Figure 20-16. Transmitter Block Diagram

11-Bit Transmit Register

SCI Data Registers

Internal Bus

Transmitter Control

Chapter 20 Serial Communication Interface (S12SCIV5)

Collision Detect

(From Receiver)