LPC1837FET256,551 NXP Semiconductors, LPC1837FET256,551 Datasheet - Page 786

• Manufacturer Part Number: LPC1837FET256,551
• Description: Microcontrollers (MCU) 32BIT ARM CORTEX-M3 MCU 136KB SRAM
• Manufacturer: NXP Semiconductors
• Series: LPC18xxr

Specifications of LPC1837FET256,551

• Core: ARM Cortex M3
• Core Processor: ARM® Cortex-M3™
• Core Size: 32-Bit
• Speed: 150MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, Microwire, SD/MMC, SPI, SSI, SSP, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, I²S, Motor Control PWM, POR, PWM, WDT
• Number Of I /o: 80
• Program Memory Size: 1MB (1M x 8)
• Program Memory Type: FLASH
• Eeprom Size: -
• Ram Size: 136K x 8
• Voltage - Supply (vcc/vdd): 2 V ~ 3.6 V
• Data Converters: A/D 16x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 256-LBGA
• Lead Free Status / Rohs Status: Details
• Other names: 935293795551

NXP Semiconductors
35.4 General description
<Document ID>
User manual
35.4.1 I2S connection schemes
The I2S performs serial data out via the transmit channel and serial data in via the receive
channel. These support the NXP Inter IC Audio format for 8-bit, 16-bit and 32-bit audio
data, both for stereo and mono modes. Configuration, data access and control is
performed by a APB register set. Data streams are buffered by FIFOs with a depth of
8 words.
The I2S receive and transmit stage can operate independently in either slave or master
mode. Within the I2S module the difference between these modes lies in the word select
(WS) signal which determines the timing of data transmissions. Data words start on the
next falling edge of the transmitting clock after a WS change. In stereo mode when WS is
low left data is transmitted and right data when WS is high. In mono mode the same data
is transmitted twice, once when WS is low and again when WS is high.
I2S1 is automatically a slave to I2S0 if no external pins are selected for the I2S1 clock and
data lines.
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The sampling frequency (fs) can range (in practice) from 16 to 192 kHz (16, 22.05, 32,
44.1, 48, 96, or 192 kHz) for audio applications.
Separate Master Clock outputs for both transmit and receive channels support a clock
up to 512 times the I
Word Select period in master mode is configurable (separately for I
output).
Two 8 word (32 byte) FIFO data buffers are provided, one for transmit and one for
receive.
Generates interrupt requests when buffer levels cross a programmable boundary.
Two DMA requests, controlled by programmable buffer levels. These are connected
to the General Purpose DMA block.
Controls include reset, stop and mute options separately for I2S input and I2S output.
In master mode, word select is generated internally with a 9-bit counter. The half
period count value of this counter can be set in the control register.
In slave mode, word select is input from the relevant bus pin.
When an I2S bus is active, the word select, receive clock and transmit clock signals
are sent continuously by the bus master, while data is sent continuously by the
transmitter.
Disabling the I2S can be done with the stop or mute control bits separately for the
transmit and receive.
The stop bit will disable accesses by the transmit channel or the receive channel to
the FIFOs and will place the transmit channel in mute mode.
The mute control bit will place the transmit channel in mute mode. In mute mode, the
transmit channel FIFO operates normally, but the output is discarded and replaced by
zeroes. This bit does not affect the receive channel, data reception can occur
normally.
All information provided in this document is subject to legal disclaimers.
Rev. 00.13 — 20 July 2011
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Chapter 35: LPC18xx I2S interface
UM10430
© NXP B.V. 2011. All rights reserved.
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