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UM10503
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© NXP B.V. 2015. All rights reserved.
User manual
Rev. 2.1 — 10 December 2015
426 of 1441
NXP Semiconductors
UM10503
Chapter 17: LPC43xx/LPC43Sxx System Control Unit (SCU)/ IO
17.4.7 ADC1 function select register
Remark:
See
for parts for which the ADC inputs are shared between the
ADC0 and ADC1.
For pins with digital and analog functions, this register selects the ADC1 function over any
of the possible digital functions.
In addition, each analog function is pinned out on a dedicated analog pin which is not
affected by this register.
The following pins are controlled by the ENAIO1 register:
By default, all pins are connected to their digital function 0 and only the digital pad is
available.
To select the analog function, the pad must be set as follows using the corresponding
SFSP register:
1. Tri-state the output driver by selecting an input at the pinmux e.g. GPIO function in
input mode.
2. Disable the receiver by setting the EZI bit to zero (see
or
the default setting.
3. Disable the pull-up resistor by setting the EPUN bit to one, and disable the pull-down
resistor by setting the EPD bit to zero.
4. Set the bit corresponding to the analog function to 1 in the ENAIO1 register.
6
ADC0_6
Select ADC0_6
0
R/W
0
Digital function selected on pin PB_6.
1
Analog function ADC0_6 selected on pin PB_6.
31:7
Reserved
-
-
Table 198. ADC0 function select register (ENAIO0, address 0x4008 6C88) bit description
Bit
Symbol
Value Description
Reset
value
Access
Table 199. Pins controlled by the ENAIO1 register
Pin
ADC function
ENAIO1 register bit
PC_3
ADC1_0
0
PC_0
ADC1_1
1
PF_9
ADC1_2
2
PF_6
ADC1_3
3
PF_5
ADC1_4
4
PF_11
ADC1_5
5
P7_7
ADC1_6
6
PF_7
ADC1_7
7