Uart3 with hdlc encoder, 1 introduction, 2 implementation details – Cirrus Logic EP93xx User Manual

Page 577: 1 uart3 package dependency, Chapter 16. uart3 with hdlc encoder -1, 1 introduction -1 16.2 implementation details -1, 1 uart3 package dependency -1, Table 16-1. uart3 pin functionality -1, Chapter 16, Uart3 with

DS785UM1

16-1

Chapter 16

UART3 With HDLC Encoder

16.1 Introduction

Note: This chapter applies only to the EP9307, EP9312, and EP9315 processors.

UART3 implements both a UART and an HDLC interface identical to that of UART1; it does
not implement the modem interface. An additional output signal, TENn, is provided to support
RS-485 operation by providing direction control of external data transceivers. The OUT1 and
OUT2 signals in the MCR register define the TENn operating mode. TENn can be configured
to assert whenever the UART transmit buffer has data to send, or to operate under software
control.

For additional details about UART1, refer to

Chapter 14

“UART1 With HDLC and Modem

Control Signals” on page 14-1

16.2 Implementation Details

16.2.1 UART3 Package Dependency

UART3 uses package pins RXD2, TXD2 and EGPIO[3]. See

Table 16-1

for details.

The use of EGPIO[3] is determined by several bits in Syscon register DeviceCfg. See

Table 16-2

for details.