MEC1404 Datasheet, PDF (273/572 Pages) Microchip Technology – Keyboard and Embedded Controller Products for Notebook PC

MEC140X/1X
17.0 UART
17.1 Introduction
The 16550 UART (Universal Asynchronous Receiver/Transmitter) is a full-function Two Pin Serial Port that supports the
standard RS-232 Interface.
17.2 References
• EIA Standard RS-232-C specification
17.3 Interface
This block is designed to be accessed externally via the pin interface and internally via a registered host interface.
FIGURE 17-1:
I/O DIAGRAM OF BLOCK
Host Interface
UART
Power, Clocks and Reset
Signal Description
Interrupts
17.4 Signal Description
TABLE 17-1: SIGNAL DESCRIPTION TABLE
Name
DTR#
Direction
Output
Description
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.
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DS00001956D-page 273