Datasheet

LPC1850_30_20_10 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 6.4 — 18 August 2014 63 of 150
NXP Semiconductors
LPC1850/30/20/10
32-bit ARM Cortex-M3 microcontroller
7.8.1 ISP (In-System Programming) mode
In-System Programming (ISP) means programming or reprogramming the on-chip SRAM
memory, using the boot loader software and the USART0 serial port. ISP can be
performed when the part resides in the end-user board. ISP loads data into on-chip SRAM
and execute code from on-chip SRAM.
7.9 Boot ROM
The internal ROM memory is used to store the boot code of the LPC1850/30/20/10. After
a reset, the ARM processor will start its code execution from this memory.
The boot ROM memory includes the following features:
• The ROM memory size is 64 kB.
• Supports booting from external static memory such as NOR flash, SPI flash, quad SPI
flash, USB0, and USB1.
• Includes API for OTP programming.
• Includes a flexible USB device stack that supports Human Interface Device (HID),
Mass Storage Class (MSC), and Device Firmware Upgrade (DFU) drivers.
Several boot modes are available depending on the values of the OTP bits BOOT_SRC. If
the OTP memory is not programmed or the BOOT_SRC bits are all zero, the boot mode is
determined by the states of the boot pins P2_9, P2_8, P1_2, and P1_1.
[1] The boot loader programs the appropriate pin function at reset to boot using either SSP0 or SPIFI.
Remark: Pin functions for SPIFI and SSP0 boot are different.
Table 4. Boot mode when OTP BOOT_SRC bits are programmed
Boot mode BOOT_SRC
bit 3
BOOT_SRC
bit 2
BOOT_SRC
bit 1
BOOT_SRC
bit 0
Description
Pin state 0 0 0 0 Boot source is defined by the reset state of P1_1,
P1_2, P2_8, and P2_9 pins. See Table 5
.
USART0 0 0 0 1 Boot from device connected to USART0 using pins
P2_0 and P2_1.
SPIFI 0 0 1 0 Boot from Quad SPI flash connected to the SPIFI
interface using pins P3_3 to P3_8.
EMC 8-bit 0 0 1 1 Boot from external static memory (such as NOR
flash) using CS0 and an 8-bit data bus.
EMC 16-bit 0 1 0 0 Boot from external static memory (such as NOR
flash) using CS0 and a 16-bit data bus.
EMC 32-bit 0 1 0 1 Boot from external static memory (such as NOR
flash) using CS0 and a 32-bit data bus.
USB0011 0Boot from USB0.
USB1011 1Boot from USB1.
SPI (SSP0) 1 0 0 0 Boot from SPI flash connected to the SSP0
interface on P3_3 (function SSP0_SCK), P3_6
(function SSP0_SSEL), P3_7 (function
SSP0_MISO), and P3_8 (function SSP0_MOSI)
[1]
.
USART3 1 0 0 1 Boot from device connected to USART3 using pins
P2_3 and P2_4.