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User manual Rev. 12.3 — 10 June 2014 427 of 547

NXP Semiconductors

UM10398

Chapter 26: LPC111x/LPC11Cxx Flash programming firmware

26.5.6 Prepare sector(s) for write operation <start sector number> <end

sector number> (UART ISP)

This command makes flash write/erase operation a two step process.

26.5.7 Copy RAM to flash <Flash address> <RAM address> <no of bytes>

(UART ISP)

When writing to the flash, the following limitations apply:

1. The smallest amount of data that can be written to flash by the copy RAM to flash

command is 256 byte (equal to one page).

2. One page consists of 16 flash words (lines), and the smallest amount that can be

modified per flash write is one flash word (one line). This limitation follows from the

application of ECC to the flash write operation, see Section 26.3.7

3. To avoid write disturbance (a mechanism intrinsic to flash memories), an erase should

be performed after following 16 consecutive writes inside the same page. Note that

the erase operation then erases the entire sector.

Table 380. UART ISP Read Memory command

Command R

Input Start Address: Address from where data bytes are to be read. This address

should be a word boundary.

Number of Bytes: Number of bytes to be read. Count should be a multiple of 4.

Return Code CMD_SUCCESS followed by <actual data (UU-encoded)> |

ADDR_ERROR (Address not on word boundary) |

ADDR_NOT_MAPPED |

COUNT_ERROR (Byte count is not a multiple of 4) |

PARAM_ERROR |

CODE_READ_PROTECTION_ENABLED

Description This command is used to read data from RAM or flash memory. This command is

blocked when code read protection is enabled.

Example "R 268435456 4<CR><LF>" reads 4 bytes of data from address 0x1000 0000.

Table 381. UART ISP Prepare sector(s) for write operation command

Command P

Input Start Sector Number

End Sector Number: Should be greater than or equal to start sector number.

Return Code CMD_SUCCESS |

BUSY |

INVALID_SECTOR |

PARAM_ERROR

Description This command must be executed before executing "Copy RAM to flash" or "Erase

Sector(s)" command. Successful execution of the "Copy RAM to flash" or "Erase

Sector(s)" command causes relevant sectors to be protected again. The boot

block can not be prepared by this command. To prepare a single sector use the

same "Start" and "End" sector numbers.

Example "P 0 0<CR><LF>" prepares the flash sector 0.