ARM7 datasheet(15/38 Pages) PHILIPS

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9397 750 14985

Preliminary data sheet

Rev. 01 — 3 October 2005

15 of 38

Philips Semiconductors

LPC2141/42/44/46/48

Single-chip 16-bit/32-bit microcontrollers

6.7 Fast general purpose parallel I/O

Device pins that are not connected to a speciﬁc peripheral function are controlled by the

GPIO registers. Pins may be dynamically conﬁgured as inputs or outputs. Separate

registers allow setting or clearing any number of outputs simultaneously. The value of the

output register may be read back, as well as the current state of the port pins.

LPC2141/42/44/46/48 introduce accelerated GPIO functions over prior LPC2000 devices:

• GPIO registers are relocated to the ARM local bus for the fastest possible I/O timing.

• 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 LPC2141/42 contain one and the LPC2144/46/48 contain two analog to digital

converters. These converters are single 10-bit successive approximation analog to digital

converters. While ADC0 has six channels, ADC1 has eight channels. Therefore, total

number of available ADC inputs for LPC2141/42 is 6 and for LPC2144/46/48 is 14.

6.8.1 Features

• 10 bit successive approximation analog to digital converter.

• Measurement range of 0 V to VREF (2.0 V

≤ VREF ≤ V

DDA).

• Each converter capable of performing more than 400,000 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 (LPC2142/44/46/48 only).

6.9 10-bit DAC

The DAC enables the LPC2141/42/44/46/48 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.

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