PIC32MX250F128C-I/SO 查看數據表（PDF） - Microchip Technology

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PIC32MX250F128C-I/SO

32-bit Microcontrollers (up to 128 KB Flash and 32 KB SRAM) with Audio and Graphics Interfaces, USB, and Advanced Analog

Microchip Technology 

PIC32MX1XX/2XX

REGISTER 21-4: AD1CHS: ADC INPUT SELECT REGISTER

Bit

Bit

Bit

Bit

Bit

Bit

Range 31/23/15/7 30/22/14/6 29/21/13/5 28/20/12/4 27/19/11/3

R/W-0

U-0

U-0

U-0

R/W-0

31:24

CH0NB

—

—

—

R/W-0

U-0

U-0

U-0

R/W-0

23:16

CH0NA

—

—

—

U-0

15:8

—

U-0

U-0

U-0

U-0

—

—

—

—

U-0

7:0

—

U-0

U-0

U-0

U-0

—

—

—

—

Bit

Bit

26/18/10/2 25/17/9/1

R/W-0

R/W-0

CH0SB<3:0>

R/W-0

R/W-0

CH0SA<3:0>

U-0

U-0

—

—

U-0

U-0

—

—

Bit

24/16/8/0

R/W-0

R/W-0

U-0

—

U-0

—

Legend:

R = Readable bit

-n = Value at POR

W = Writable bit

‘1’ = Bit is set

U = Unimplemented bit, read as ‘0’

‘0’ = Bit is cleared

x = Bit is unknown

bit 31

bit 30-28

bit 27-24

bit 23

bit 22-20

bit 19-16

bit 15-0

CH0NB: Negative Input Select bit for Sample B

1 = Channel 0 negative input is AN1

0 = Channel 0 negative input is VREFL

Unimplemented: Read as ‘0’

CH0SB<3:0>: Positive Input Select bits for Sample B

1111 = Channel 0 positive input is Open(1)

1110 = Channel 0 positive input is IVREF(2)

1101 = Channel 0 positive input is CTMU temperature sensor (CTMUT)(3)

1100 = Channel 0 positive input is AN12(4)

•

•

•

0001 = Channel 0 positive input is AN1

0000 = Channel 0 positive input is AN0

CH0NA: Negative Input Select bit for Sample A Multiplexer Setting(2)

1 = Channel 0 negative input is AN1

0 = Channel 0 negative input is VREFL

Unimplemented: Read as ‘0’

CH0SA<3:0>: Positive Input Select bits for Sample A Multiplexer Setting

1111 = Channel 0 positive input is Open(1)

1110 = Channel 0 positive input is IVREF(2)

1101 = Channel 0 positive input is CTMU temperature (CTMUT)(3)

1100 = Channel 0 positive input is AN12(4)

•

•

•

0001 = Channel 0 positive input is AN1

0000 = Channel 0 positive input is AN0

Unimplemented: Read as ‘0’

Note 1:

2:

3:

4:

This selection is only used with CTMU capacitive and time measurement.

See Section 23.0 “Comparator Voltage Reference (CVREF)” for more information.

See Section 24.0 “Charge Time Measurement Unit (CTMU)” for more information.

AN12 is only available on 44-pin devices. AN6-AN8 are not available on 28-pin devices.

© 2011 Microchip Technology Inc.

Preliminary

DS61168C-page 209

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