ZUSBOPTSC01ZAC datasheet(149/402 Pages) ZILOG

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PS024604-1005

P R E L I M I N A R Y

LIN-UART Baud Rate Generator

Z8FMC16100 Series Flash MCU

Product Specification

127

The transmitter can be enabled in this mode.

LIN-UART Baud Rate Generator

The LIN-UART Baud Rate Generator creates a lower frequency baud rate clock for data

transmission. The input to the Baud Rate Generator is the system clock. The LIN-UART

Baud Rate High and Low Byte registers combine to create a 16-bit baud rate divisor value

(BRG[15:0]) that sets the data transmission rate (baud rate) of the LIN-UART. The LIN-

UART data rate is calculated using the following equation for normal UART operation:

The LIN-UART data rate is calculated using the following equation for LIN mode UART

operation:

When the LIN-UART is disabled, the Baud Rate Generator can function as a basic 16-bit

timer with interrupt on time-out. To configure the Baud Rate Generator as a timer with

interrupt on time-out, complete the following procedure:

1. Disable the LIN-UART receiver by clearing the REN bit in the LIN-UART Control 0

2. Load the appropriate 16-bit count value into the LIN-UART Baud Rate High and Low

Byte registers.

3. Enable the Baud Rate Generator timer function and associated interrupt by setting the

BRGCTL

bit in the LIN-UART Control 1 Register to 1.

Noise Filter

A noise filter circuit is included which filters noise on a digital input signal (such as UART

Receive Data) before the data is sampled by the block. This is likely to be a requirement

for protocols with a noisy environment.

The noise filter contains the following features:

• Synchronizes the receive input data to the System Clock

• Noise Filter Enable (NFEN) input selects whether the noise filter is bypassed (NFEN =

0) or included (NFEN = 1) in the receive data path.

UART Data Rate (bits/s) =

System Clock Frequency (Hz)

16 x UART Baud Rate Divisor Value

UART Data Rate (bits/s) =

System Clock Frequency (Hz)

UART Baud Rate Divisor Value

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