OM13008,598 NXP Semiconductors, OM13008,598 Datasheet - Page 291

• Manufacturer Part Number: OM13008,598
• Description: BOARD LPC XPRESSO LPC122X
• Manufacturer: NXP Semiconductors
• Series: LPCXpressor

Specifications of OM13008,598

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-6642; OM13008

NXP Semiconductors
UM10441
User manual
18.6.2 Voltage ladder register
Table 274. Comparator control register (CMP, address 0x4005 4000) bit description
This register enables the voltage ladder for the comparator reference input. The reference
input VREF_CMP is programmable in 32 levels from V
Table 275. Voltage ladder register (VLAD, address 0x4005 4004) bit description
Bit
19:17 CMP1_VM_CTRL
20
21
22
31:23 -
Bit
0
5:1
6
31:7
Symbol
VLADEN
VSEL
VLADREF
-
Symbol
INTCLR
CMP0STAT
CMP1STAT
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Value Description
0
1
0
1
Rev. 1.1 — 10 March 2011
Value
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
Voltage ladder enable
Voltage ladder value. The reference voltage Vref depends on
Voltage reference select
Voltage ladder disabled.
Voltage ladder enabled.
the setting of bit 6 in this register (either V
pin VREF_CMP):
0000 = V
0001 = 1 × Vref/31
0010 = 2 × Vref/31
...
11111 = Vref
VREF_CMP pin
V
Unused
DD(3V3)
Description
Selection of comparator 1, negative voltage (VM)
input channel.
Voltage ladder output
ACMP1_I0
ACMP1_I1
ACMP1_I2
ACMP1_I3
ACMP0_I0
ACMP0_I1
BOD 0.9 V band gap
Interrupt clear bit. Setting this bit to one clears the
comparator interrupt.
Comparator 0 status. This bit reflects the state of the
comparator 0 output.
Comparator 1 status. This bit reflects the state of the
comparator 1 output.
Reserved.
pin
SS
Chapter 18: LPC122x Comparator
SS
to VREF_CMP = 3.3 V.
DD(3V3)
or voltage on
UM10441
© NXP B.V. 2011. All rights reserved.
291 of 442
Reset
value
0
0
1
0
Reset
value
000
0