Silicon Laboratories C8051F342, C8051F347 SFR Definition 7.2. CPT0MX Comparator0 MUX Selection

C8051F340/1/2/3/4/5/6/7

SFR Definition 7.2. CPT0MX: Comparator0 MUX Selection

R/W R/W R/W R/W R/W R/W R/W R/W Reset Value

-	CMX0N2	CMX0N1	CMX0N0	-	CMX0P2	CMX0P1	CMX0P0
Bit7	Bit6	Bit5	Bit4	Bit3	Bit2	Bit1	Bit0

00000000

SFR Address:

0x9F

Bit7:	UNUSED. Read = 0b, Write = don’t care.
Bits6–4: CMX0N2–CMX0N0: Comparator0 Negative Input MUX Select.
	These bits select which Port pin is used as the Comparator0 negative input.
	CMX0N1	CMX0N1	CMX0N0	Negative Input	Negative Input
				(32-pin Package)	(48-pin Package)
	0	0	0	P1.1	P2.1
	0	0	1	P1.5	P2.6
	0	1	0	P2.1	P3.5
	0	1	1	P2.5	P4.4
	1	0	0	P0.1	P0.4
Bit3:	UNUSED. Read = 0b, Write = don’t care.
Bits2–0: CMX0P2–CMX0P0: Comparator0 Positive Input MUX Select.
	These bits select which Port pin is used as the Comparator0 positive input.
	CMX0P1	CMX0P1	CMX0P0	Positive Input	Positive Input
				(32-pin Package)	(48-pin Package)
	0	0	0	P1.0	P2.0
	0	0	1	P1.4	P2.5
	0	1	0	P2.0	P3.4
	0	1	1	P2.4	P4.3
	1	0	0	P0.0	P0.3

Note that the port pins used by the comparator depend on the package type (32-pin or 48-pin).

Rev. 0.5 63