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LPC1102UK

32-bit ARM Cortex-M0 microcontroller; 32 kB flash and 8 kB SRAM

NXP Semiconductors. 

NXP Semiconductors

LPC1102/1104

32-bit ARM Cortex-M0 microcontroller

7.15.4 Code security (Code Read Protection - CRP)

This feature of the LPC1102/1104 allow user to enable different levels of security in the

system so that access to the on-chip flash and use of the Serial Wire Debugger (SWD)

can be restricted. When needed, CRP is invoked by programming a specific pattern into a

dedicated flash location. IAP commands are not affected by the CRP.

There are three levels of Code Read Protection:

1. CRP1 disables access to the chip via the SWD and allows partial flash update

(excluding flash sector 0). This mode is useful when CRP is required and flash field

updates are needed but all sectors can not be erased.

2. CRP2 disables access to the chip via the SWD and only allows full flash erase and

update.

3. Running an application with level CRP3 selected fully disables any access to the chip

via the SWD pins.

Remark: The LPC1102 does not provide an ISP entry pin to be monitored at reset. For all

three CRP levels, the user’s application code must provide a flash update mechanism

which reinvokes ISP by defining a user-selected PIOn pin for ISP entry.

CAUTION

If Code Read Protection of any level (CRP1, CRP2 or CRP3) is selected, no future factory

testing can be performed on the device.

7.15.5 APB interface

The APB peripherals are located on one APB bus.

7.15.6 AHBLite

The AHBLite connects the CPU bus of the ARM Cortex-M0 to the flash memory, the main

static RAM, and the Boot ROM.

7.15.7 External interrupt inputs

All GPIO pins can be level or edge sensitive interrupt inputs. In addition, start logic inputs

serve as external interrupts (see Section 7.15.1).

7.16 Emulation and debugging

Debug functions are integrated into the ARM Cortex-M0. Serial wire debug with four

breakpoints and two watchpoints is supported.

Remark: Care must be taken when using the SPI because the SPI clock SCK and the

serial wire debug clock SWCLK share the same pin on the WLCSP16 package. Once the

SPI is enabled, the serial wire debugger is no longer available (LPC1102 only).

LPC1102_1104

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 7 — 26 September 2013

© NXP B.V. 2013. All rights reserved.

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