NXP Semiconductors LPC24XX UM10237 - Manual (Page 683)

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User manual Rev. 04 — 26 August 2009 683 of 792
NXP Semiconductors
UM10237
Chapter 30: LPC24XX Flash memory programming firmware
In case a CRP mode is enabled and access to the chip is allowed via the ISP, an
unsupoorted or restricted ISP command will be terminated with return code
CODE_READ_PROTECTION_ENABLED.
9. ISP commands
The following commands are accepted by the ISP command handler. Detailed status
codes are supported for each command. The command handler sends the return code
INVALID_COMMAND when an undefined command is received. Commands and return
codes are in ASCII format.
CMD_SUCCESS is sent by ISP command handler only when received ISP command has
been completely executed and the new ISP command can be given by the host.
Exceptions from this rule are "Set Baud Rate", "Write to RAM", "Read Memory", and "Go"
commands.
Table 602. Code Read Protection hardware/software interaction
CRP option User Code
Valid P2.10 pin at
reset JTAG enabled LPC2400
enters ISP
mode
partial Flash
Update in ISP
mode
No No X Yes Yes Yes
No Yes High Yes No NA
No Yes Low Yes Yes Yes
CRP1 Yes High No No NA
CRP1 Yes Low No Yes Yes
CRP2 Yes High No No NA
CRP2 Yes Low No Yes No
CRP3 Yes x No No NA
CRP1 No x No Yes Yes
CRP2 No x No Yes No
CRP3 No x No Yes No
Table 603. ISP command summary
ISP Command Usage Described in
Unlock U Table 30–604
Set Baud Rate B Table 30–605
Echo A Table 30–607
Write to RAM W Table 30–608
Read Memory R Table 30–609
Prepare sector(s) for
write operation P Table 30–610
Copy RAM to Flash C Table 30–611
Go G Table 30–612
Erase sector(s) E Table 30–613
Blank check sector(s) I Table 30–614