LPC178X datasheet(52/120 Pages) NXP

52 / 120 page

LPC178X_7X

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Preliminary data sheet

Rev. 4 — 1 May 2012

52 of 120

NXP Semiconductors

LPC178x/7x

32-bit ARM Cortex-M3 microcontroller

• GPIO registers are accessed through the AHB multilayer bus so that the fastest

possible I/O timing can be achieved.

• Mask registers allow treating sets of port bits as a group, leaving other bits

unchanged.

• All GPIO registers are byte and half-word addressable.

• Entire port value can be written in one instruction.

• Support for Cortex-M3 bit banding.

• Support for use with the GPDMA controller.

Additionally, any pin on Port 0 and Port 2 providing a digital function can be programmed

to generate an interrupt on a rising edge, a falling edge, or both. The edge detection is

asynchronous, so it may operate when clocks are not present such as during Power-down

mode. Each enabled interrupt can be used to wake up the chip from Power-down mode.

7.17.1 Features

• Bit level set and clear registers allow a single instruction to set or clear any number of

bits in one port.

• Direction control of individual bits.

• All I/O default to inputs after reset.

• Pull-up/pull-down resistor configuration and open-drain configuration can be

programmed through the pin connect block for each GPIO pin.

7.18 12-bit ADC

The LPC178x/7x contain one ADC. It is a single 12-bit successive approximation ADC

with eight channels and DMA support.

7.18.1 Features

• 12-bit successive approximation ADC.

• Input multiplexing among eight pins.

• Power-down mode.

• Measurement range VSS to VREFP.

• 12-bit conversion rate: up to 400 kHz.

• Individual channels can be selected for conversion.

• Burst conversion mode for single or multiple inputs.

• Optional conversion on transition of input pin or Timer Match signal.

• Individual result registers for each ADC channel to reduce interrupt overhead.

• DMA support.

7.19 10-bit DAC

The LPC178x/7x contain one DAC. The DAC allows to generate a variable analog output.

The maximum output value of the DAC is VREFP.

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