HCS08 datasheet(147/374 Pages) NXP

147 / 374 page

Analog-to-Digital Converter (S08ADC12V1)

MC9S08JM60 Series Data Sheet, Rev. 5

Freescale Semiconductor

147

10.4

Functional Description

The ADC module is disabled during reset or when the ADCH bits are all high. The module is idle when a

conversion has completed and another conversion has not been initiated. When idle, the module is in its

lowest power state.

The ADC can perform an analog-to-digital conversion on any of the software selectable channels. In 12-bit

and 10-bit mode, the selected channel voltage is converted by a successive approximation algorithm into

a 12-bit digital result. In 8-bit mode, the selected channel voltage is converted by a successive

approximation algorithm into a 9-bit digital result.

When the conversion is completed, the result is placed in the data registers (ADCRH and ADCRL). In

10-bit mode, the result is rounded to 10 bits and placed in the data registers (ADCRH and ADCRL). In

8-bit mode, the result is rounded to 8 bits and placed in ADCRL. The conversion complete flag (COCO)

is then set and an interrupt is generated if the conversion complete interrupt has been enabled (AIEN = 1).

The ADC module has the capability of automatically comparing the result of a conversion with the

contents of its compare registers. The compare function is enabled by setting the ACFE bit and operates

with any of the conversion modes and configurations.

Table 10-12. APCTL3 Register Field Descriptions

Field

Description

ADPC23

ADC Pin Control 23. ADPC23 controls the pin associated with channel AD23.

0 AD23 pin I/O control enabled

1 AD23 pin I/O control disabled

ADPC22

ADC Pin Control 22. ADPC22 controls the pin associated with channel AD22.

0 AD22 pin I/O control enabled

1 AD22 pin I/O control disabled

ADPC21

ADC Pin Control 21. ADPC21 controls the pin associated with channel AD21.

0 AD21 pin I/O control enabled

1 AD21 pin I/O control disabled

ADPC20

ADC Pin Control 20. ADPC20 controls the pin associated with channel AD20.

0 AD20 pin I/O control enabled

1 AD20 pin I/O control disabled

ADPC19

ADC Pin Control 19. ADPC19 controls the pin associated with channel AD19.

0 AD19 pin I/O control enabled

1 AD19 pin I/O control disabled

ADPC18

ADC Pin Control 18. ADPC18 controls the pin associated with channel AD18.

0 AD18 pin I/O control enabled

1 AD18 pin I/O control disabled

ADPC17

ADC Pin Control 17. ADPC17 controls the pin associated with channel AD17.

0 AD17 pin I/O control enabled

1 AD17 pin I/O control disabled

ADPC16

ADC Pin Control 16. ADPC16 controls the pin associated with channel AD16.

0 AD16 pin I/O control enabled

1 AD16 pin I/O control disabled

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