LPC2157 datasheet(18/45 Pages) NXP

18 / 45 page

LPC2157_2158_2

Product data sheet

Rev. 02 — 9 February 2009

18 of 45

NXP Semiconductors

LPC2157/2158

Single-chip 16-bit/32-bit microcontrollers

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

unchanged.

• All GPIO registers are byte addressable.

• Entire port value can be written in one instruction.

6.7.1 Features

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

bits in one port.

• Direction control of individual bits.

• Separate control of output set and clear.

• All I/O default to inputs after reset.

6.8 10-bit ADC

The LPC2157/2158 contain two single 10-bit successive approximation ADCs. While

ADC0 has eight channels (six channels for LPC2158), ADC1 has eight channels.

Therefore, the total number of available ADC inputs for LPC2157 is 16 and for LPC2158 is

14.

6.8.1 Features

• 10-bit successive approximation ADC.

• Measurement range of 0 V to VREF (2.0 V

≤ VREF ≤ V

DDA).

• Each converter capable of performing more than 400000 10-bit samples per second.

• Every analog input has a dedicated result register to reduce interrupt overhead.

• Burst conversion mode for single or multiple inputs.

• Optional conversion on transition on input pin or timer match signal.

• Global Start command for both converters.

6.9 10-bit DAC

The DAC enables the LPC2157/2158 to generate a variable analog output. The maximum

DAC output voltage is the VREF voltage.

6.9.1 Features

• 10-bit DAC.

• Buffered output.

• Power-down mode available.

• Selectable speed versus power.

6.10 USB 2.0 device controller (LPC2158 only)

The USB is a 4-wire serial bus that supports communication between a host and a

number (127 max) of peripherals. The host controller allocates the USB bandwidth to

attached devices through a token based protocol. The bus supports hot plugging,

unplugging, and dynamic conﬁguration of the devices. All transactions are initiated by the

host controller.

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