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UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
293 of 1269
NXP Semiconductors
UM10503
Chapter 15: LPC43xx System Control Unit (SCU)/ IO configuration
•
P8_0 to P8_2
•
PA_1 to PA_3
Table 134. Pin configuration registers for high-drive pins (SFS, address 0x4008 60C4
(SFSP1_17) to 0x4008 650C (SFSPA_3) bit description
Bit
Symbol
Value
Description
Reset
value
Access
2:0
MODE
Select pin function.
0
R/W
0x0
Function 0 (default)
0x1
Function 1
0x2
Function 2
0x3
Function 3
0x4
Function 4
0x5
Function 5
0x6
Function 6
0x7
Function 7
3
EPD
Enable pull-down resistor at pad.
0
R/W
0
Disable pull-down.
1
Enable pull-down. Enable both pull-down
resistor and pull-up resistor for repeater
mode.
4
EPUN
Disable pull-up resistor at pad. By default,
the pull-up resistor is enabled at reset.
0
R/W
0
Enable pull-up. Enable both pull-down
resistor and pull-up resistor for repeater
mode.
1
Disable pull-up
5
-
Reserved
-
-
6
EZI
Input buffer enable. The input buffer is
disabled by default at reset but must be
enabled to transfer data from the I/O buffer to
the pad.
0
R/W
0
Disable input buffer
1
Enable input buffer
7
ZIF
Input glitch filter. Disable the input glitch filter
for clocking signals higher than 30 MHz.
0
R/W
0
Enable input glitch filter
1
Disable input glitch filter
9:8
EHD
Select drive strength.
0
R/W
0x0
Normal-drive: 4 mA drive strength
0x1
Medium-drive: 8 mA drive strength
0x2
High-drive: 14 mA drive strength
0x3
Ultra high-drive: 20 mA drive strength
31:10
-
Reserved
-
-