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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
36 of 1441
NXP Semiconductors
UM10503
Chapter 3: LPC43xx/LPC43Sxx Memory mapping
Remark:
Although the EEPROM is mapped in a bit-banding capable region, attempts to
write access the EEPROM in the bit-banding aliased memory space will not result in a bit
write
3.3.3 On-chip flash
The available flash configuration for the LPC435x/3x/2x/1x and LPC43S5x/S3x are shown
in
. An integrated flash accelerator maximizes performance for use with the two
fast AHB buses.
The flash memory interface includes an intelligent buffering scheme. It can be beneficial
to locate code and static data over the two flash memories to enable parallel code and
data access or to avoid that interrupts corrupt buffer content. The buffers are aligned on
32-byte boundaries.
3.3.4 On-chip EEPROM
The LPC436x/5x/3x/2x/1x and LPC43S6x/5x/3x parts with flash also include a 16 kB
EEPROM. The EEPROM is divided into 128 pages. The last EEPROM page is protected.
3.3.5 Memory retention in the Power-down modes
In Deep-sleep mode, all SRAM content is retained. At wake-up the system can restart
immediately.
In Power-down mode, only the top 8 kB of the SRAM block starting at 0x1008 0000 is
retained - that is 8 kB of SRAM located at 0x1009 0000 for devices with 72 kB SRAM and
8 kB of SRAM located at 0x1008 8000 for devices with 40 kB of SRAM (see
). All other SRAM content is lost. Common practice is to store the stack
and other variables that need to be retained in this 8 kB memory space as well as code to
restart the rest of the system.
In Deep power-down mode, no SRAM content is retained. Variables that need to be
retained in deep power down can be stored in the 256-byte register file located in the RTC
domain at 0x4004 1000.
Table 11.
LPC435x/3x/2x/1x and LPC43S5x/S3x Flash configuration
Part
Flash bank A
256 kB
Flash bank A
128 kB
Flash bank A
128 kB
Flash bank B
256 kB
Flash bank B
128 kB
Flash bank B
128 kB
Total flash
staring at address:
0x1A00 0000
0x1A04 000
0x1A06 0000
0x1B00 0000
0x1B04 0000
0x1B06 0000
LPC43x7
yes
yes
yes
yes
yes
yes
1 MB
LPC43x5
yes
yes
no
yes
yes
no
768 kB
LPC43x3
yes
no
no
yes
no
no
512 kB
LPC43x2
yes
yes
yes
no
no
no
512 kB
LPC43Sx7 yes
yes
yes
yes
yes
yes
1 MB