MC9S08QE16CLC Datasheet, PDF(137/350 Page) Freescale Semiconductor, Inc – Low-power wireless applications, Gas, water and heater meters

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MC9S08QE16CLC Datasheet, PDF (137/350 Pages) Freescale Semiconductor, Inc – Low-power wireless applications, Gas, water and heater meters

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Chapter 9 ï

Analog-to-Digital Converter (S08ADC10V1)

9.1 Overview

The 10-bit analog-to-digital converter (ADC) is a successive approximation ADC designed for operation

within an integrated microcontroller system-on-chip. The ADC module design supports up to 28 separate

analog inputs (AD0-AD27). Only 18 (AD0-AD15, AD26, and AD27) of the possible inputs are

implemented on the MC9S08AC60 Series Family of MCUs. These inputs are selected by the ADCH bits.

Some inputs are shared with I/O pins as shown in Figure 9-1. All of the channel assignments of the ADC

for the MC9S08AC60 Series devices are summarized in Table 9-1.

9.2 Channel Assignments

The ADC channel assignments for the MC9S08AC60 Series devices are shown in the table below.

Channels that are unimplemented are internally connected to VREFL. Reserved channels convert to an

unknown value. Channels which are connected to an I/O pin have an associated pin control bit as shown.

ADCH

00000

00001

00010

00011

00100

00101

00110

00111

01000

01001

01010

Channel

AD0

AD1

AD2

AD3

AD4

AD5

AD6

AD7

AD8

AD9

AD10

01011 AD11

01100 AD12

01101

01110

AD13

AD14

01111 AD15

Table 9-1. ADC Channel Assignment

Input

PTB0/ADCP0

PTB1/ADCP1

PTB2/ADCP2

PTB3/ADCP3

PTB4/ADCP4

PTB5/ADCP5

PTB6/ADCP6

PTB7/ADCP7

PTD0/ADCP8

PTD1/ADCP9

PTD2/ADCP10/

KBI1P5

PTD3/ADCP11/

KBI1P6

PTD4/ADCP12/

TPM2CLK

PTD5/ADCP13

PTD6/ADCP14/

TPM1CLK

PTD7/ADCP15/

KBI1P7

Pin Control

ADPC0

ADPC1

ADPC2

ADPC3

ADPC4

ADPC5

ADPC6

ADPC7

ADPC8

ADPC9

ADPC10

ADPC11

ADPC12

ADPC13

ADPC14

ADPC15

ADCH

10000

10001

10010

10011

10100

10101

10110

10111

11000

11001

11010

11011

Channel

AD16

AD17

AD18

AD19

AD20

AD21

AD22

AD23

AD24

AD25

AD26

AD27

Input

VREFL

VREFL

VREFL

VREFL

VREFL

VREFL

Reserved

Reserved

Reserved

Reserved

Temperature

Sensor1

Internal Bandgap2

Pin Control

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

N/A

11100

-

Reserved

N/A

11101 VREFH

VREFH

N/A

11110 VREFL

VREFL

N/A

11111 module

None

N/A

disabled

MC9S08AC60 Series Data Sheet, Rev. 3

Freescale Semiconductor

137

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