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:
System Clock Frequency (Hz)
UART Data Rate (bits/s) =
16 x UART Baud Rate Divisor Value
The LIN-UART data rate is calculated using the following equation for LIN mode UART
operation:
System Clock Frequency (Hz)
UART Data Rate (bits/s) =
UART Baud Rate Divisor Value
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 RENbit in the LIN-UART Control 0
Register to 0 (TENbit may be asserted, transmit activity may occur).
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
BRGCTLbit 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.
PS024604-1005
P R E L I M I N A R Y
LIN-UART Baud Rate Generator
ZILOG [ ZILOG, INC. ]
