LPC2138 Philips Semiconductors, LPC2138 Datasheet - Page 22

• Manufacturer Part Number: LPC2138
• Description: (LPC2131 - LPC2138) Single-chip 16/32-bit microcontrollers 32/64/512 kB ISP/IAP Flash with 10-bit ADC and DAC
• Manufacturer: Philips Semiconductors

Philips Semiconductors
9397 750 14868
Preliminary data sheet
6.15.1 Features
6.16.1 Features
6.17.1 Features
6.15 SPI serial I/O controller
6.16 SSP serial I/O controller
6.17 General purpose timers/external event counters
The LPC2131/2132/2134/2136/2138 each contain one SPI controller. The SPI is a full
duplex serial interface, designed to be able to handle multiple masters and slaves
connected to a given bus. Only a single master and a single slave can communicate on
the interface during a given data transfer. During a data transfer the master always sends
a byte of data to the slave, and the slave always sends a byte of data to the master.
The LPC2131/2132/2134/2136/2138 each contain one Serial Synchronous Port controller
(SSP). The SSP controller is capable of operation on a SPI, 4-wire SSI, or Microwire bus.
It can interact with multiple masters and slaves on the bus. However, only a single master
and a single slave can communicate on the bus during a given data transfer. The SSP
supports full duplex transfers, with frames of 4 bits to 16 bits of data flowing from the
master to the slave and from the slave to the master. Often only one of these data flows
carries meaningful data.
The Timer/Counter is designed to count cycles of the peripheral clock (PCLK) or an
externally supplied clock, and optionally generate interrupts or perform other actions at
specified timer values, based on four match registers. It also includes four capture inputs
to trap the timer value when an input signal transitions, optionally generating an interrupt.
Multiple pins can be selected to perform a single capture or match function, providing an
application with ‘or’ and ‘and’, as well as ‘broadcast’ functions among them.
At any given time only one of peripheral’s capture inputs can be selected as an external
event signal source, i.e., timer’s clock. The rate of external events that can be successfully
counted is limited to PCLK/2. In this configuration, unused capture lines can be selected
as regular timer capture inputs.
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Compliant with Serial Peripheral Interface (SPI) specification.
Synchronous, Serial, Full Duplex, Communication.
Combined SPI master and slave.
Maximum data bit rate of one eighth of the input clock rate.
Compatible with Motorola SPI, 4-wire TI SSI and National Semiconductor Microwire
buses.
Synchronous Serial Communication.
Master or slave operation.
8-frame FIFOs for both transmit and receive.
Four bits to 16 bits per frame.
A 32-bit Timer/Counter with a programmable 32-bit Prescaler.
Rev. 02 — 15 April 2005
LPC2131/2132/2134/2136/2138
Single-chip 16/32-bit microcontrollers
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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