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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
151 of 1441
NXP Semiconductors
UM10503
Chapter 11: LPC43xx/LPC43Sxx Configuration Registers (CREG)
11.4.8 ETB SRAM configuration register
This register selects how the 16 kB block of RAM located at address 0x2000 C000 is
used. This RAM memory block can be accessed either by the ETB or be used as normal
SRAM on the AHB bus.
11.4.9 CREG6 control register
This register controls various aspects of the LPC43xx:
•
Bits 2:0 control the Ethernet PHY interface. The ethernet block reads this register
during set-up. Therefore the ethernet must be reset after changing the PHY interface.
Table 103. Flash Accelerator Configuration for flash bank B register (FLASHCFGB, address 0x4004 3124) 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)
Table 104. ETB SRAM configuration register (ETBCFG, address 0x4004 3128) bit description
Bit
Symbol
Value Description
Reset
value
Access
0
ETB
Select SRAM interface
1
R/W
0
ETB accesses SRAM at address 0x2000 C000.
1
AHB accesses SRAM at address 0x2000 C000.
31:1
-
Reserved.
-
-