Texas Instruments MSP430x4xx - Manual (Page 330)

Comparator_A Registers
17-10 Comparator_A
CACTL1, Comparator_A Control Register 1
7 6 5 4 3 2 1 0
CAEX CARSEL CAREFx CAON CAIES CAIE CAIFG
rw−(0) rw−(0) rw−(0) rw−(0) rw−(0) rw−(0) rw−(0) rw−(0)
CAEX Bit 7 Comparator_A exchange. This bit exchanges the comparator inputs and
inverts the comparator output.
CARSEL Bit 6 Comparator_A reference select. This bit selects which terminal the V
CAREF
is applied to.
When CAEX = 0:
0
V
CAREF
is applied to the + terminal
1 V
CAREF
is applied to the – terminal
When CAEX = 1:
0
V
CAREF
is applied to the – terminal
1 V
CAREF
is applied to the + terminal
CAREF Bits
5-4 Comparator_A reference. These bits select the reference voltage V
CAREF.
00 Internal reference off. An external reference can be applied.
01 0.25*V
CC
10 0.50*V
CC
11 Diode reference is selected
CAON Bit 3 Comparator_A on. This bit turns on the comparator. When the comparator
is off it consumes no current. The reference circuitry is enabled or disabled
independently.
0
Off
1 On
CAIES Bit 2 Comparator_A interrupt edge select
0
Rising edge
1 Falling edge
CAIE Bit 1 Comparator_A interrupt enable
0
Disabled
1 Enabled
CAIFG Bit 0 The Comparator_A interrupt flag
0
No interrupt pending
1 Interrupt pending