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UM10503
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User manual
Rev. 2.1 — 10 December 2015
1348 of 1441
NXP Semiconductors
UM10503
Chapter 48: 12-bit ADC (ADCHS)
48.6.15 Descriptor table 1 register
These registers contain the descriptor entries of table 1. Register 0x44n
contains descriptor n (n=0,1..7).
See
(Descriptor Table 0 Register) for details on descriptor tables.
24
RESET_TIMER
1: reset descriptor timer.
0x0
30:25 -
Reserved
0x0
31
UPDATE_TABLE
1: Update table with all 8 descriptors of this table.
Descriptors of this table that are written without this bit set
are not updated until any descriptor of this table is written
with this bit set.
This field is write only. A read returns 0x0.
0x0
Table 1137.Descriptor table 0 registers (DESCRIPTOR0_[0:7], address 0x400F 0300
(DESCRIPTOR0_0) to 0x400F 031C (DESCRIPTOR0_7)) bit description
Bit
Symbol
Description
Reset
value
Table 1138.Descriptor table 1 registers (DESCRIPTOR1_[0:7], address 0x400F 0320
(DESCRIPTOR1_0) to 0x400F 033C (DESCRIPTOR1_7)) bit description
Bit
Symbol
Description
Reset
value
2:0
CHANNEL_NR
0: convert input 0
1: convert input 1
2: convert input 2
3: convert input 3
4: convert input 4
5: convert input 5
6,7: reserved
0x0
3
HALT
0: After this descriptor continue with the next descriptor.
1: halt after this descriptor is processed. Restart at a new
trigger.
0x0
4
INTERRUPT
1: Raise interrupt when ADC result is available
0x0
5
POWER_DOWN
1: Power down after this conversion.
0x1
7:6
BRANCH
00: Continue with next descriptor (wraps around after
top).
01: Branch to the first descriptor in this table.
10: Swap tables and branch to the first descriptor of the
new table.
11: reserved (do not store sample). Continue with next
descriptor (wraps around after top).
0x3
21:8
MATCH_VALUE
Evaluate this descriptor when descriptor timer value is
equal to match value.
0x90
23:22 THRESHOLD_SEL Indicates which threshold comparison level register set is
to be used:
00: no comparison,
01: THR_A.
10: THR_B.
11: Reserved
0x0