UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
284 of 1269
NXP Semiconductors
UM10503
Chapter 15: LPC43xx System Control Unit (SCU)/ IO configuration
15.3.10 EMC signal delay control
The SCU contains a programmable delay control for all EMC SDRAM clocks
(see
15.3.11 Pin multiplexing
Multiplexed digital pins are grouped into 16 pin groups, named P0 to P9 and PA to PF,
with up to 20 pins used per group. Each digital pin can support up to eight different digital
functions, including General Purpose I/O (GPIO), selectable through the SCU registers. In
addition, some pins support an analog function (ADC inputs and DAC output) selectable
through the ENAIO registers. Note that the pin name is not indicative of the GPIO port
assigned to it.
15.4 Register description
The system control unit contains the registers to configure the pin function of multiplexed
digital pins, the EMC clock delays, and the GPIO pin interrupts.
Remark:
The boot loader configures the pins involved in the boot process (see
) when the part starts up. The reset values given in
for the pin
configuration registers and EMC delay registers do not take into account the changes
performed by the boot loader.
Table 132. Register overview: System Control Unit (SCU) (base address 0x4008 6000)
Name
Access Address
offset
Description
Reset
value
Reset
value
after
EMC
boot
Reset
value
after
UART
boot
Reference
Pins P0_n
SFSP0_0
R/W
0x000
Pin configuration register for pin P0_0
0x00
0x00
0x00
SFSP0_1
R/W
0x004
Pin configuration register for pin P0_1
0x00
0x00
0x00
-
-
0x008 -
0x07C
Reserved
-
-
-
Pins P1_n
SFSP1_0
R/W
0x080
Pin configuration register for pin P1_0
0x00
0xD2
0x00
SFSP1_1
R/W
0x084
Pin configuration register for pin P1_1
0x00
0xD2
0x00
SFSP1_2
R/W
0x088
Pin configuration register for pin P1_2
0x00
0xD2
0x00
SFSP1_3
R/W
0x08C
Pin configuration register for pin P1_3
0x00
0xD3
0x00
SFSP1_4
R/W
0x090
Pin configuration register for pin P1_4
0x00
0xD3
0x00
SFSP1_5
R/W
0x094
Pin configuration register for pin P1_5
0x00
0xD3
0x00
SFSP1_6
R/W
0x098
Pin configuration register for pin P1_6
0x00
0xD3
0x00
SFSP1_7
R/W
0x09C
Pin configuration register for pin P1_7
0x00
0xD3
0x00
SFSP1_8
R/W
0x0A0
Pin configuration register for pin P1_8
0x00
0xD3
0x00
SFSP1_9
R/W
0x0A4
Pin configuration register for pin P1_9
0x00
0xD3
0x00
SFSP1_10
R/W
0x0A8
Pin configuration register for pin P1_10
0x00
0xD3
0x00
SFSP1_11
R/W
0x0AC
Pin configuration register for pin P1_11
0x00
0xD3
0x00