Z8F082ASH020SC datasheet(113/244 Pages) ZILOG

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PS024705-0405

P R E L I M I N A R Y

UART

Z8 Encore! XP® F08xA Seriess

Product Specification

(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 104.

UART Transmit Data Register

Data bytes written to the UART Transmit Data register (Table 60) 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 60. UART Transmit Data Register (U0TXD)

BITS

FIELD

TXD

RESET

XXX

R/W

WWW

ADDR

F40H

UART Data Rate (bits/s)

System Clock Frequency (Hz)

UART Baud Rate Divisor Value

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Z8F082ASH020SC Datasheet(PDF) 113 Page - Zilog, Inc.

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