MC68HC05P18A Datasheet, PDF (91/130 Pages) Freescale Semiconductor, Inc – HCMOS Microcontroller Unit

Freescale Semiconductor, Inc.
Technical Data — MC68HC05P18A
Section 11. Analog-to-Digital (A/D) Converter
11.1 Contents
11.2 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .91
11.3 Analog Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
11.3.1 Ratiometric Conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
11.3.2 Reference Supply Voltage (V_REFH) . . . . . . . . . . . . . . . . . . .92
11.3.3 Accuracy and Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
11.4 Conversion Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92
11.5 Digital Section. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
11.5.1 Conversion Times . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .93
11.5.2 Internal versus External Oscillator . . . . . . . . . . . . . . . . . . . .93
11.5.3 Multi-Channel Operation . . . . . . . . . . . . . . . . . . . . . . . . . . .94
11.6 A/D Status and Control Register. . . . . . . . . . . . . . . . . . . . . . . .94
11.7 A/D Conversion Data Register . . . . . . . . . . . . . . . . . . . . . . . . .96
11.8 A/D Subsystem Operation during Wait Mode
and Halt Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .96
11.9 A/D Subsystem Operation during Stop Mode. . . . . . . . . . . . . .96
11.2 Introduction
The MC68HC05P18A 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.
MC68HC05P18A
Analog-to-Digital (A/D) Converter
For More Information On This Product,
Go to: www.freescale.com
Technical Data