mc68hc908ld64 Freescale Semiconductor, Inc, mc68hc908ld64 Datasheet - Page 183

• Manufacturer Part Number: mc68hc908ld64
• Description: M68hc08 Microcontrollers Microcontroller
• Manufacturer: Freescale Semiconductor, Inc

13.8 I/O Registers
13.8.1 ADC Status and Control Register
MC68HC908LD64
Freescale Semiconductor
—
Rev. 3.0
Address:
Three I/O registers control and monitor ADC operation:
Function of the ADC status and control register is described here.
COCO — Conversions Complete Bit
AIEN — ADC Interrupt Enable Bit
Reset:
Read:
Write:
•
•
•
When the AIEN bit is a logic 0, the COCO is a read-only bit which is
set each time a conversion is completed. This bit is cleared whenever
the ADC status and control register is written, or whenever the ADC
data register is read. Reset clears this bit.
When the AIEN bit is a logic 1 (CPU interrupt enabled), the COCO is
a read-only bit, and will always be logic 0 when read.
When this bit is set, an interrupt is generated at the end of an ADC
conversion. The interrupt signal is cleared when the data register is
read or the status and control register is written. Reset clears the
AIEN bit.
Figure 13-3. ADC Status and Control Register (ADSCR)
1 = conversion completed (AIEN = 0)
0 = conversion not completed (AIEN = 0)
1 = ADC interrupt enabled
0 = ADC interrupt disabled
ADC status and control register (ADSCR)
ADC data register (ADR)
ADC input clock register (ADICLK)
$003B
COCO
Bit 7
Analog-to-Digital Converter (ADC)
0
= Unimplemented
AIEN
6
0
ADCO
5
0
ADCH4
4
1
ADCH3
3
1
Analog-to-Digital Converter (ADC)
ADCH2
2
1
ADCH1
1
1
I/O Registers
Data Sheet
ADCH0
Bit 0
1
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