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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
420 of 1441
NXP Semiconductors
UM10503
Chapter 17: LPC43xx/LPC43Sxx System Control Unit (SCU)/ IO
17.4.2 Pin configuration registers for high-drive pins
Each digital pin and each clock pin on the LPC43xx/LPC43Sxx have an associated pin
configuration register which determines the pin’s function and electrical characteristics.
The assigned functions for each pin are listed in
.
The pin configuration registers for high-drive pins control the following pins:
•
P1_17
•
P2_3 to P2_5
Table 192. Pin configuration registers for normal-drive pins (SFS, address 0x4008 6000
(SPSP0_0) to 0x4008 67AC (SFSPF_11)) 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
EHS
Select Slew rate.
0
R/W
0
Slow (low noise with medium speed)
1
Fast (medium noise with fast speed)
6
EZI
Input buffer enable. The input buffer is
disabled by default at reset and must be
enabled for receiving.
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
31:8
-
Reserved
-
-