LPC1857_53 NXP Semiconductors, LPC1857_53 Datasheet - Page 66

• Manufacturer Part Number: LPC1857_53
• Description: The LPC1857/53 are ARM Cortex-M3 based microcontrollers for embedded applications
• Manufacturer: NXP Semiconductors

NXP Semiconductors
LPC1857_53
Objective data sheet
7.13.1.1 Features
7.13.1 AES decryption
7.13.2 One-Time Programmable (OTP) memory
7.14.1 Features
7.13 Decryption features
7.14 General Purpose I/O (GPIO)
The hardware AES decryption can decode data using the AES algorithm using a 128-bit
key.
Remark: Once an AES key is programmed, no future factory testing can be performed on
this device.
The OTP provides 32 bit of memory for general-purpose use and two 128-bit non-volatile
memory blocks to store AES keys or other customer data.
The LPC1857/53 provides 8 GPIO ports with up to 16 GPIO pins each.
The GPIO registers control device pin functions that are not connected to a specific
peripheral function. Pins can be dynamically configured as inputs or outputs. Separate
registers allow setting or clearing any number of outputs simultaneously. The value of the
output register can be read back as well as the current state of the port pins.
All GPIO pins default to inputs with pull-up resistors enabled on reset.
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Decoding of external flash data connected to the quad SPI Flash Interface (SPIFI).
Secure storage of keys.
Support for CMAC hash calculation to authenticate encrypted data.
Data is processed in little endian mode. This means that the first byte read from flash
is integrated into the AES codeword as least significant byte. The 16th byte read from
flash is the most significant byte of the first AES codeword.
AES engine performance of 1 byte/clock cycle.
DMA transfers supported through the GPDMA.
Accelerated GPIO functions:
– GPIO registers are located on the AHB so that the fastest possible I/O timing can
– Mask registers allow treating sets of port bits as a group, leaving other bits
– All GPIO registers are byte and half-word addressable.
– Entire port value can be written in one instruction.
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.
All I/O default to inputs after reset.
be achieved.
unchanged.
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 14 December 2011
32-bit ARM Cortex-M3 microcontroller
LPC1857/53
© NXP B.V. 2011. All rights reserved.
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