CEC1712 datasheet(118/338 Pages) MICROCHIP

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CEC1712

DS00003416C-page 118

 2020-2021 Microchip Technology Inc.

10.0 UART

10.1

Introduction

The 16550 UART (Universal Asynchronous Receiver/Transmitter) is a full-function Serial Port that supports the stan-

dard RS-232 Interface.

10.2

References

• EIA Standard RS-232-C specification

10.3

Interface

This block is designed to be accessed externally via the pin interface and internally via a registered host interface.

10.4

Signal Description

FIGURE 10-1:

I/O DIAGRAM OF BLOCK

TABLE 10-1:

SIGNAL DESCRIPTION TABLE

Name

Direction

Description

DTR#

Output

Active low Data Terminal ready output for the Serial Port.

Handshake output signal notifies modem that the UART is ready to

transmit data. This signal can be programmed by writing to bit 1 of

the Modem Control Register (MCR).

Note:

Defaults to tri-state on V3_DUAL power on.

DCD#

Input

Active low Data Carrier Detect input for the serial port.

Handshake signal which notifies the UART that carrier signal is

detected by the modem. The CPU can monitor the status of DCD#

signal by reading bit 7 of Modem Status Register (MSR). A DCD#

signal state change from low to high after the last MSR read will set

MSR bit 3 to a 1. If bit 3 of Interrupt Enable Register is set, the inter-

rupt is generated when DCD # changes state.

Signal Description

UART

Interrupts

Power, Clocks and Reset

Host Interface

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