Datasheet

MC68HC812A4 Data Sheet, Rev. 7
Freescale Semiconductor 195
Chapter 16
Analog-to-Digital Converter (ATD)
16.1 Introduction
The analog-to-digital converter (ATD) is an 8-channel, 8-bit, multiplexed-input, successive approximation
analog-to-digital converter, accurate to ±1 least significant bit (LSB). It does not require external sample
and hold circuits because of the type of charge redistribution technique used. The ATD converter timing
can be synchronized to the system P-clock. The ATD module consists of a 16-word (32-byte)
memory-mapped control register block used for control, testing, and configuration.
16.2 Features
Features of the ATD module include:
• Eight multiplexed input channels
• Multiplexed-input successive approximation
• 8-bit resolution
• Single or continuous conversion
• Conversion complete flag with CPU interrupt request
• Selectable ATD clock