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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
150 of 1441
NXP Semiconductors
UM10503
Chapter 11: LPC43xx/LPC43Sxx Configuration Registers (CREG)
11.4.7 Flash Accelerator Configuration register for flash bank B
Remark:
This register is implemented on parts with on-chip flash only. See
.
Following reset, flash accelerator functions are enabled and flash access timing is set to a
default value of 16 clocks.
Changing the FLASHCFG register value causes the flash accelerator to invalidate all of
the holding latches, resulting in new reads of flash information as required. This
guarantees synchronization of the flash accelerator to CPU operation.
Remark:
Bits 11 to 0 of the FLASHCFG register control internal flash accelerator
functions and should not be altered.
Table 102. Flash Accelerator Configuration for flash bank A register (FLASHCFGA, address 0x4004 3120) bit
description
Bit
Symbol
Value Description
Reset
value
11:0
-
-
Reserved. Do not change these bits from the reset value.
0x3A
15:12 FLASHTIM
Flash access time. The value of this field plus 1 gives the number of BASE_M4_CLK
clocks used for a flash access.
Warning:
Improper setting of this value may result in incorrect operation of the
device.
All other values are allowed but may not be optimal for the supported clock
frequencies.
0xF
0x0
1 BASE_M4_CLK clock. Use for BASE_M4_CLK up to 21 MHz.
0x1
2 BASE_M4_CLK clocks. Use for BASE_M4_CLK up to 43 MHz.
0x2
3 BASE_M4_CLK clocks. Use for BASE_M4_CLK up to 64 MHz.
0x3
4 BASE_M4_CLK clocks. Use for BASE_M4_CLK up to 86 MHz.
0x4
5 BASE_M4_CLK clocks. Use for BASE_M4_CLK up to 107 MHz.
0x5
6 BASE_M4_CLK clocks. Use for BASE_M4_CLK up to 129 MHz.
0x6
7 BASE_M4_CLK clocks. Use for BASE_M4_CLK up to 150 MHz.
0x7
8 BASE_M4_CLK clocks. Use for BASE_M4_CLK up to 172 MHz.
0x8
9 BASE_M4_CLK clocks. Use for BASE_M4_CLK up to 193 MHz.
0x9
10 BASE_M4_CLK clocks. Use for BASE_M4_CLK up to 204 MHz. Safe setting for
all allowed conditions.
30:16 -
Reserved. Write zeros only to these bits.
0
31
POW
Flash bank A power control
1
0
Power-down
1
Active (Default)