UM10503
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© NXP B.V. 2012. All rights reserved.
User manual
Rev. 1.3 — 6 July 2012
1159 of 1269
NXP Semiconductors
UM10503
Chapter 44: LPC43xx 10-bit ADC0/1
19:17 CLKS
This field selects the number of clocks used for each conversion in Burst mode
and the number of bits of accuracy of the result in the LS bits of ADDR,
between 11 clocks (10 bits) and 4 clocks (3 bits).
000
0x0
11 clocks / 10 bits
0x1
10 clocks / 9 bits
0x2
9 clocks / 8 bits
0x3
8 clocks / 7 bits
0x4
7 clocks / 6 bits
0x5
6 clocks / 5 bits
0x6
5 clocks / 4 bits
0x7
4 clocks / 3 bits
20
-
-
Reserved, user software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
-
21
PDN
Power mode
0
0
The A/D converter is in Power-down mode.
1
The A/D converter is operational.
23:22 -
-
Reserved, user software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
-
26:24 START
Controls the start of an A/D conversion when the BURST bit is 0.
0
0x0
No start (this value should be used when clearing PDN to 0).
0x1
Start now.
0x2
Start conversion when the edge selected by bit 27 occurs on CTOUT_15
(combined timer output 15, ADC start0).
0x3
Start conversion when the edge selected by bit 27 occurs on CTOUT_8
(combined timer output 8, ADC start1).
0x4
Start conversion when the edge selected by bit 27 occurs on ADCTRIG0 input
(ADC start3).
0x5
Start conversion when the edge selected by bit 27 occurs on ADCTRIG1 input
(ADC start4).
0x6
Start conversion when the edge selected by bit 27 occurs on Motocon PWM
output MCOA2 (ADC start5).
0x7
Reserved.
27
EDGE
Controls rising or falling edge on the selected signal for the start of a
conversion. This bit is significant only when the START field contains 0x2
-0x6).
0
0
Rising edge.
1
Falling edge.
31:28 -
-
Reserved, user software should not write ones to reserved bits. The value read
from a reserved bit is not defined.
-
Table 1010.A/D Control register (CR - address 0x400E 3000 (ADC0) and 0x400E 4000 (ADC1)) bit description
Bit
Symbol
Value
Description
Reset
value