LPC1850 datasheet(36/84 Pages) NXP

36 / 84 page

LPC1850_30_20_10

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Objective data sheet

Rev. 1 — 3 January 2011

36 of 84

NXP Semiconductors

LPC1850/30/20/10

32-bit ARM Cortex-M3 microcontroller

7.10 Security features

7.10.1 AES decryption engine

The hardware AES engine can decrypt data using the AES algorithm.

7.10.1.1

Features

• Decryption of external flash data connected to the quad SPI Flash Interface (SPIFI).

• Secure storage of decryption 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.

7.10.2 One-Time Programmable (OTP) memory

The OTP provides two 128-bit non-volatile memories to store AES decryption keys or

other custom data.

7.11 General Purpose I/O (GPIO)

The LPC1850/30/20/10 provides 5 GPIO ports with up to 16 GPIO pins each.

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.

All GPIO pins default to inputs with pull-up resistors enabled on reset.

7.11.1 Features

• Accelerated GPIO functions:

– GPIO registers are located on the AHB so that the fastest possible I/O timing can

be achieved.

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

unchanged.

– 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.

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