MC68HC05P18 Datasheet, PDF (79/144 Pages) Freescale Semiconductor, Inc – Advance Information

Freescale Semiconductor, Inc.
Advance Information — MC68HC05P18/MC68HC805P18
Section 9. Analog-to-Digital (A/D) Converter
9.1 Contents
9.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .79
9.3 Analog Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
9.3.1 Ratiometric Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
9.3.2
9.3.3
V_REFH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
Accuracy and Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
9.3.4 Conversion Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .80
9.4 Digital Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
9.4.1 Conversion Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .81
9.4.2 Internal versus External Oscillator . . . . . . . . . . . . . . . . . . . .81
9.4.3 Multi-Channel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .82
9.5 A/D Status and Control Register. . . . . . . . . . . . . . . . . . . . . . . .82
9.6 A/D Conversion Data Register . . . . . . . . . . . . . . . . . . . . . . . . .84
9.7 A/D Subsystem During Wait/Halt Modes . . . . . . . . . . . . . . . . .84
9.8 A/D Subsystem Operation During Stop Mode . . . . . . . . . . . . .84
9.2 Introduction
The MC68HC(8)05P18 includes a 4-channel, multiplexed input, 8-bit
successive approximation analog-to-digital (A/D) converter. The A/D
subsystem shares its inputs with port C pins PC3–PC7.
MC68HC(8)05P18 — Rev. 2.0
MOTOROLA
Analog-to-Digital (A/D) Converter
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Advance Information
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