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UM10503
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User manual
Rev. 2.1 — 10 December 2015
1341 of 1441
NXP Semiconductors
UM10503
Chapter 48: 12-bit ADC (ADCHS)
48.6.5 Trigger register
A write to this register starts the descriptor timer and descriptor table processing. The reg-
ister is always read as 0x0.
48.6.6 Descriptor status register
This register contains the active descriptor table and active descriptor entry values.
This register can also be used to set active descriptor table and active descriptor entry
values. The new values will be updated immediately.
Remark:
This register should only be updated when descriptors are not running (halted).
48.6.7 Power-down register
This register enables ADC power down mode. This register will also be set, or cleared, by
the descriptor table processor.
48.6.8 Configuration register
This register configures the trigger source. For an external trigger it selects the active
edge or level and whether the external signal should be synchronized. Synchronization is
needed for short duration trigger inputs. Synchronization introduces a latency of 2-3 ADC
clock cycles. When synchronization is set here then it is recommended not to set SYNC in
the trigger selection block (
When CHANNEL_ID_EN is set the channel ID is pre-fixed to the FIFO output data.
Table 1126.Trigger register (TRIGGER, address 0x400F 0010) bit description
Bit
Symbol
Description
Reset value
0
SW_TRIGGER
Auto cleared
0x0
31:1
-
Reserved
-
Table 1127.Descriptor status register (DSCR_STS, address 0x400F 0014) bit description
Bit
Symbol
Description
Reset
value
0
ACT_TABLE
0 = table 0 is active
1 = table 1 is active.
0x0
3:1
ACT_DESCRIPTOR ID of the descriptor that is active.
0x0
31:4
-
Reserved
-
Table 1128.Power-down register (POWER_DOWN, address 0x400F 0018) bit description
Bit
Symbol
Description
Reset
value
0
PD_CTRL
0 = disable power down mode. Register holds value until set by
writing 1 to this bit or by descriptor processor when descriptor
field POWER_DOWN is set.
1 = enable power down mode. Register holds value until
cleared by writing 0 to this bit or by descriptor processor when
waking up RECOVERY_TIME before a conversion.
0x1
31:1
-
Reserved
-