MC68HC11A8FN1 查看數據表（PDF） - Motorola => Freescale

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MC68HC11A8FN1

8-Bit Microcontrollers

Motorola => Freescale 

E CLOCK

12 E CYCLES

SAMPLE ANALOG INPUT

MSB

4

CYCLES

BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 LSB 2

2

2

2

2

2

2

2 CYC

CYC CYC CYC CYC CYC CYC CYC END

SUCCESSIVE APPROXIMATION SEQUENCE

CONVERT FIRST

CONVERT SECOND

CONVERT THIRD

CONVERT FOURTH

CHANNEL, UPDATE

CHANNEL, UPDATE

CHANNEL, UPDATE

CHANNEL, UPDATE

0

ADR1

32

ADR2

64

ADR3

96

ADR4

128 — E CYCLES

Figure 14 A/D Conversion Sequence

A/D CONVERSION TIM

ANALOG

INPUT

PIN

< 2 pF

+ ~20V

– ~0.7V

INPUT

PROTECTION

DEVICE

+ ~12V

– ~0.7V

DUMMY N-CHANNEL

OUTPUT DEVICE

DIFFUSION/POLY

COUPLER

≤ 4 KΩ

400 nA

JUNCTION

LEAKAGE

*

~ 20 pF

DAC

CAPACITANCE

VRL

* THIS ANALOG SWITCH IS CLOSED ONLY DURING THE 12-CYCLE SAMPLE TIME.

ANALOG INPUT PIN

Figure 15 Electrical Model of an Analog Input Pin (Sample Mode)

ADCTL — A/D Control/Status

Bit 7

6

5

4

3

2

1

CCF

0

SCAN MULT

CD

CC

CB

RESET: U

0

U

U

U

U

U

CCF — Conversions Complete Flag

Set after an A/D conversion cycle. Cleared when ADCTL is written.

SCAN — Continuous Scan Control

0 = Do four conversions and stop

1 = Convert four channels in selected group continuously

MULT — Multiple Channel/Single Channel Control

0 = Convert single channel selected

1 = Convert four channels in selected group

$1030

Bit 0

CA

U

MOTOROLA

42

MC68HC11A8

MC68HC11A8TS/D

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