Z8F021ASH020SC datasheet(119/276 Pages) ZILOG

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PS022815-0206

UART

Z8 Encore! XP® 4K Series

Product Specification

100

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

rate is calculated using the following equation:

When the UART is disabled, the Baud Rate Generator functions 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 UART by clearing the REN and TEN bits in the UART Control 0 register

to 0.

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

registers.

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

BIRQ

bit in the UART Control 1 register to 1.

When configured as a general purpose timer, the interrupt interval is calculated using the

following equation:

Interrupt Interval (s) = System Clock Period (s) ×BRG[15:0] ]

UART Control Register Definitions

The UART control registers support the UART and the associated Infrared Encoder/

Decoders. For more information about the infrared operation, refer to the Infrared

Encoder/Decoder chapter on page 109.

UART Transmit Data Register

Data bytes written to the UART Transmit Data (UxTXD) register (Table 62) are shifted

out on the TXDx pin. The Write-only UART Transmit Data register shares a Register File

address with the read-only UART Receive Data register.

Table 62. UART Transmit Data Register (U0TXD)

BITS

FIELD

TXD

RESET

XXX

R/W

WWW

ADDR

F40H

UART Data Rate (bits/s)

System Clock Frequency (Hz)

16 UART Baud Rate Divisor Value

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