Maxim-integrated MAXQ7667 Manual do Utilizador descarregar pdf (Página 78)

5-3 ___________________________________________________________________________________________________________

MAXQ7667 User’s Guide

SECTION 5: GENERAL-PURPOSE I/O MODULE

The MAXQ7667 smart data-acquisition microcontroller provides 2 ports (P0 and P1) for general-purpose I/O, each with 8 port pins. The

port pins have the following features:

• All pins support alternate and special functions

• CMOS-compatible I/O levels to DVDDIO and GND rails

• User-selectable programmable drive strength when configured as output

• User-selectable resistive pull direction when configured as input

• Rising or falling edge selectable interrupt or wakeup inputs on all digital I/O pins

• Low leakage

5.1 Architecture

5.1.1 Enhanced Type D I/O Port

The MAXQ7667 supports the enhanced Type D port. Enhanced Type D is a bidirectional I/O port that incorporates Schmitt trigger

receivers and full CMOS output drivers, and can support alternate functions. All enhanced Type D pins also have interrupt capability.

All port pins can support special function (SF). Enabling the special function automatically converts the pin to that function. Special

function is usually implemented in another functional module and supported by individual enable or status bits.

Figure 5-1 illustrates an enhanced Type D port pin function. The pin logic of each port pin is identical.

When the ports are configured as an output, the output drive strength can be set to either 1mA or 2mA by setting the PS0 and PS1

registers. When the ports are configured as an input, the resistive pull direction (either pullup or pulldown) can be set by the PR0 and

PR1 registers. The typical value is 150kΩ.

Figure 5-1. Enhanced Type D Port Pin Schematic

SF ENABLE

PRn.x

PIn.x OR SF INPUT

PDn.x

SF DIRECTION

POn.x

SF OUTPUT

PSn.x

MUXMUX

FLAG EIEn.x

EIESn.x

DETECT

CIRCUIT

INTERRUPT

FLAG

n = PORTS

x = PIN

150kΩ

DVDDIO

PORT PIN

150kΩ

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 346 347

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