CY8C54LP datasheet(30/117 Pages) CYPRESS

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PSoC® 5LP: CY8C54LP Family

Datasheet

Document Number: 001-84934 Rev. **

Page 30 of 117

6.4 I/O System and Routing

PSoC I/Os are extremely flexible. Every GPIO has analog and

digital I/O capability. All I/Os have a large number of drive modes,

which are set at POR. PSoC also provides up to four individual

I/O voltage domains through the VDDIO pins.

There are two types of I/O pins on every device; those with USB

provide a third type. Both General Purpose I/O (GPIO) and

Special I/O (SIO) provide similar digital functionality. The primary

differences are their analog capability and drive strength.

Devices that include USB also provide two USBIO pins that

support specific USB functionality as well as limited GPIO

capability.

All I/O pins are available for use as digital inputs and outputs for

both the CPU and digital peripherals. In addition, all I/O pins can

generate an interrupt. The flexible and advanced capabilities of

the PSoC I/O, combined with any signal to any pin routability,

greatly simplify circuit design and board layout. All GPIO pins can

be used for analog input, CapSense[7], and LCD segment drive,

while SIO pins are used for voltages in excess of VDDA and for

programmable output voltages.

Features supported by both GPIO and SIO:

User programmable port reset state

Separate I/O supplies and voltages for up to four groups of I/O

Digital peripherals use DSI to connect the pins

Input or output or both for CPU and DMA

Eight drive modes

Every pin can be an interrupt source configured as rising

edge, falling edge or both edges. If required, level sensitive

interrupts are supported through the DSI

Dedicated port interrupt vector for each port

Slew rate controlled digital output drive mode

Access port control and configuration registers on either port

basis or pin basis

Separate port read (PS) and write (DR) data registers to avoid

read modify write errors

Special functionality on a pin by pin basis

Additional features only provided on the GPIO pins:

LCD segment drive on LCD equipped devices

CapSense[7]

Analog input and output capability

Continuous 100 µA clamp current capability

Standard drive strength down to 1.71 V

Additional features only provided on SIO pins:

Higher drive strength than GPIO

Hot swap capability (5 V tolerance at any operating VDD)

Programmable and regulated high input and output drive

levels down to 1.2 V

No analog input, CapSense, or LCD capability

Over voltage tolerance up to 5.5 V

SIO can act as a general purpose analog comparator

USBIO features:

Full speed USB 2.0 compliant I/O

Highest drive strength for general purpose use

Input, output, or both for CPU and DMA

Input, output, or both for digital peripherals

Digital output (CMOS) drive mode

Each pin can be an interrupt source configured as rising

edge, falling edge, or both edges

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