MC68HC908JK3 MOTOROLA [Motorola, Inc], MC68HC908JK3 Datasheet - Page 138

• Manufacturer Part Number: MC68HC908JK3
• Description: MC68HC908JK1
• Manufacturer: MOTOROLA [Motorola, Inc]

Analog-to-Digital Converter (ADC)
11.3 Features
11.4 Functional Description
Technical Data
138
Addr.
$003C
$003D
$003E
ADC Input Clock Register
ADC Status and Control
Register Name
ADC Data Register
(ADICLK)
(ADSCR)
Register
(ADR)
Features of the ADC module include:
Twelve ADC channels are available for sampling external sources at
pins PTB0–PTB7 and PTD0–PTD3. An analog multiplexer allows the
single ADC converter to select one of the 12 ADC channels as ADC
voltage input (ADCVIN). ADCVIN is converted by the successive
approximation register-based counters. The ADC resolution is 8 bits.
When the conversion is completed, ADC puts the result in the ADC data
register and sets a flag or generates an interrupt.
block diagram of the ADC.
Reset:
Reset:
Reset:
Read:
Read:
Read:
Write:
Write:
Write:
Figure 11-1. ADC I/O Register Summary
•
•
•
•
•
•
12 channels with multiplexed input
Linear successive approximation with monotonicity
8-bit resolution
Single or continuous conversion
Conversion complete flag or conversion complete interrupt
Selectable ADC clock
COCO
ADIV2
Bit 7
AD7
Analog-to-Digital Converter (ADC)
0
0
ADIV1
AIEN
AD6
6
0
0
ADCO
ADIV0
AD5
5
0
0
Indeterminate after reset
CH4
AD4
4
1
0
0
CH3
AD3
3
1
0
0
MC68H(R)C908JL3
CH2
AD2
Figure 11-2
1
0
0
2
CH1
AD1
1
1
0
0
MOTOROLA
shows a
—
Rev. 1.0
Bit 0
CH0
AD0
1
0
0