MC9RS08KA8RM Datasheet, PDF (106/190 Pages) Freescale Semiconductor, Inc – MC9RS08KA8 Features

Analog-to-Digital Converter (RS08ADC10V1)
Table 10-11. APCTL3 Register Field Descriptions
Field
Description
7
ADC Pin Control 23 — ADPC23 is used to control the pin associated with channel AD23.
ADPC23 0 AD23 pin I/O control enabled
1 AD23 pin I/O control disabled
6
ADC Pin Control 22 — ADPC22 is used to control the pin associated with channel AD22.
ADPC22 0 AD22 pin I/O control enabled
1 AD22 pin I/O control disabled
5
ADC Pin Control 21 — ADPC21 is used to control the pin associated with channel AD21.
ADPC21 0 AD21 pin I/O control enabled
1 AD21 pin I/O control disabled
4
ADC Pin Control 20 — ADPC20 is used to control the pin associated with channel AD20.
ADPC20 0 AD20 pin I/O control enabled
1 AD20 pin I/O control disabled
3
ADC Pin Control 19 — ADPC19 is used to control the pin associated with channel AD19.
ADPC19 0 AD19 pin I/O control enabled
1 AD19 pin I/O control disabled
2
ADC Pin Control 18 — ADPC18 is used to control the pin associated with channel AD18.
ADPC18 0 AD18 pin I/O control enabled
1 AD18 pin I/O control disabled
1
ADC Pin Control 17 — ADPC17 is used to control the pin associated with channel AD17.
ADPC17 0 AD17 pin I/O control enabled
1 AD17 pin I/O control disabled
0
ADC Pin Control 16 — ADPC16 is used to control the pin associated with channel AD16.
ADPC16 0 AD16 pin I/O control enabled
1 AD16 pin I/O control disabled
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. The
selected channel voltage is converted by a successive approximation algorithm into an 11-bit digital result.
In 8-bit mode, the selected channel voltage is converted into a 9-bit digital result by a successive
approximation algorithm.
When the conversion completes, 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 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 can automatically compare a conversion result with the contents of its compare registers.
Set the ACFE bit to enable the compare function and operate in conjunction with any of the conversion
modes and configurations.
MC9RS08KA8 Series Reference Manual, Rev. 3
106
Freescale Semiconductor