68HC705SP7 datasheet(122/230 Pages) FREESCALE

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Analog Subsystem

General Release Specification

MC68HC705JJ7/MC68HC705JP7 — Rev. 3.0

Analog Subsystem

Table 8-5. Sample Conversion Timing (VDD = 5.0 Vdc)

Bits

Counts

(Vdc)

A/D Method

Clock Source

fOSC

(MHz)

tCHG

(ms)

CEXT

(

µF)

3.5

Software Loop

(12 bus cycles)

(24 fOSC cycles)

Mode 0 or 1 (manual)

Low Power Oscillator

0.1

3.840

0.110

External Pin Oscillator

1.0

0.384

0.011

2.0

0.192

0.006

4.0

0.096

0.003

3.5

Programmable Timer

(prescaler = 8)

Mode 2 or 3

(TOF->ICF or OCF->ICF)

Low Power Oscillator

0.1

1.280

0.037

External Pin Oscillator

1.0

0.128

0.004

2.0

0.064

0.002

4.0

0.032

0.001

3.5

Software Loop

(12 bus cycles)

(24 fOSC cycles)

Mode 0 or 1 (manual)

Low Power Oscillator

0.1

15.36

0.439

External Pin Oscillator

1.0

1.536

0.044

2.0

0.768

0.022

4.0

0.384

0.011

3.5

Programmable Timer

(prescaler = 8)

Mode 2 or 3

(TOF->ICF or OCF->ICF)

Low Power Oscillator

0.1

5.120

0.585

External Pin Oscillator

1.0

0.512

0.059

2.0

0.256

0.029

4.0

0.128

0.015

256

3.5

Software Loop

(12 bus cycles)

(24 fOSC cycles)

Mode 0 or 1 (manual)

Low Power Oscillator

0.1

61.44

1.755

External Pin Oscillator

1.0

6.144

0.176

2.0

3.072

0.088

4.0

1.536

0.044

256

3.5

Programmable Timer

(prescaler = 8)

Mode 2 or 3

(TOF->ICF or OCF->ICF)

Low Power Oscillator

0.1

20.48

0.585

External Pin Oscillator

1.0

2.048

0.059

2.0

1.024

0.029

4.0

0.512

0.015

1024

3.5

Programmable Timer

(prescaler = 8)

Mode 2 or 3

(TOF->ICF or OCF->ICF)

Low Power Oscillator

0.1

(note 1)

External Pin Oscillator

1.0

8.192

0.234

2.0

4.096

0.117

4.0

2.048

0.059

4096

3.5

Programmable Timer

(prescaler = 8)

Mode 2 or 3

(TOF->ICF or OCF->ICF)

Low Power Oscillator

0.1

(note 1)

External Pin Oscillator

1.0

32.768

0.936

2.0

16.384

0.468

4.0

8.192

0.234

1. Not usable as the value of CEXT would be greater than 2.0 µF

Freescale Semiconductor, Inc.

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