Datasheet

MC68HC908AP Family Data Sheet, Rev. 4
Freescale Semiconductor 247
Chapter 15
Analog-to-Digital Converter (ADC)
15.1 Introduction
This section describes the analog-to-digital converter (ADC). The ADC is a 8-channel 10-bit linear
successive approximation ADC.
15.2 Features
Features of the ADC module include:
• Eight channels with multiplexed input
• High impedance buffered input
• Linear successive approximation with monotonicity
• 10-bit resolution
• Single or continuous conversion
• Auto-scan conversion on four channels
• Conversion complete flag or conversion complete interrupt
• Selectable ADC clock
• Conversion result justification
– 8-bit truncated mode
– Right justified mode
– Left justified mode
– Left justified sign mode
Addr. Register Name Bit 7 654321Bit 0
$0057
ADC Status and Control
Register
(ADSCR)
Read: COCO
AIEN ADCO ADCH4 ADCH3 ADCH2 ADCH1 ADCH0
Write:
Reset:00011111
$0058
ADC Clock Control
Register
(ADICLK)
Read:
ADIV2 ADIV1 ADIV0 ADICLK MODE1 MODE0
00
Write:
R
Reset:00000100
$0059
ADC Data Register High 0
(ADRH0)
Read: ADx ADx ADx ADx ADx ADx ADx ADx
Write: RRRRRRRR
Reset:00000000
$005A
ADC Data Register Low 0
(ADRL0)
Read: ADx ADx ADx ADx ADx ADx ADx ADx
Write: RRRRRRRR
Reset:00000000
$005B
ADC Data Register Low 1
(ADRL1)
Read: AD9 AD8 AD7 AD6 AD5 AD4 AD3 AD2
Write: RRRRRRRR
Reset:00000000
Figure 15-1. ADC I/O Register Summary