NXP Semiconductors LPC1751, User Manual, Page: 604 / 808

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UM10360_0 © NXP B.V. 2009. All rights reserved.
User manual Rev. 00.06 — 5 June 2009 604 of 808
NXP Semiconductors
UM10360
Chapter 32: LPC17xx Flash memory interface and programming
Setting function pointer:
iap_entry=(IAP) IAP_LOCATION;
Whenever you wish to call IAP you could use the following statement.
iap_entry (command, result);
The IAP call could be simplified further by using the symbol definition file feature
supported by ARM Linker in ADS (ARM Developer Suite). You could also call the IAP
routine using assembly code.
As per the ARM specification (The ARM Thumb Procedure Call Standard SWS ESPC
0002 A-05) up to 4 parameters can be passed in the r0, r1, r2 and r3 registers
respectively. Additional parameters are passed on the stack. Up to 4 parameters can be
returned in the r0, r1, r2 and r3 registers respectively. Additional parameters are returned
indirectly via memory. Some of the IAP calls require more than 4 parameters. If the ARM
suggested scheme is used for the parameter passing/returning then it might create
problems due to difference in the C compiler implementation from different vendors. The
suggested parameter passing scheme reduces such risk.
The flash memory is not accessible during a write or erase operation. IAP commands,
which results in a flash write/erase operation, use 32 bytes of space in the top portion of
the on-chip RAM for execution. The user program should not be use this space if IAP flash
programming is permitted in the application.
Table 570. IAP Command Summary
IAP Command Command Code Described in
Prepare sector(s) for write operation 50
10
Table 32–571
Copy RAM to Flash 51
10
Table 32–572
Erase sector(s) 52
10
Table 32–573
Blank check sector(s) 53
10
Table 32–574
Read part ID 54
10
Table 32–575
Read Boot Code version 55
10
Table 32–576
Read device serial number 58
10
Table 32–577
Compare 56
10
Table 32–578
Reinvoke ISP 57
10
Table 32–579