C8051F93X-C8051F92X 데이터 시트보기 (PDF) - Silicon Laboratories

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C8051F93X-C8051F92X

Single/Dual Battery, 0.9–3.6 V, 64/32 kB, SmaRTClock, 10-Bit ADC MCU

Silicon Laboratories 

C8051F93x-C8051F92x

SFR Definition 5.12. ADC0MX: ADC0 Input Channel Select

Bit

7

6

5

4

3

2

1

0

Name

AD0MX

Type

R

R

R

R/W

R/W

R/W

R/W

R/W

Reset

0

0

0

1

1

1

1

1

SFR Page = 0x0; SFR Address = 0xBB

Bit Name

Function

7:5 Unused Unused.

Read = 000b; Write = Don’t Care.

4:0 AD0MX AMUX0 Positive Input Selection.

Selects the positive input channel for ADC0.

00000:

00001:

P0.0

P0.1

10000:

10001:

P2.0 (C8051F920/30 Only)

P2.1 (C8051F920/30 Only)

00010:

00011:

P0.2

P0.3

10010:

10011:

P2.2 (C8051F920/30 Only)

P2.3 (C8051F920/30 Only)

00100:

00101:

P0.4

P0.5

10100:

10101:

P2.4 (C8051F920/30 Only)

P2.5 (C8051F920/30 Only)

00110:

P0.6

10110:

P2.6 (C8051F920/30 Only)

00111:

01000:

P0.7

P1.0

10111:

11000:

Reserved.

Reserved.

01001:

01010:

01011:

01100:

01101:

01110:

01111:

P1.1

P1.2

P1.3

P1.4

P1.5

P1.6

P1.7 (C8051F920/30

Only)

11001:

11010:

11011:

11100:

11101:

11110:

Reserved.

Reserved.

Temperature Sensor*

VBAT Supply Voltage

(0.9–1.8 V) or (1.8–3.6 V)

Digital Supply Voltage

(VREG0 Output, 1.7 V Typical)

VDD/DC+ Supply Voltage

(1.8–3.6 V)

11111:

Ground

*Note: Before switching the ADC multiplexer from another channel to the temperature sensor, the ADC mux should

select the 'Ground' channel as an intermediate step. The intermediate 'Ground' channel selection step will

discharge any voltage on the ADC sampling capacitor from the previous channel selection. This will prevent

the possibility of a high voltage (> 2V) being presented to the temperature sensor circuit, which can otherwise

impact its long-term reliability.

Rev. 1.3

85

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