HCS08 datasheet(134/374 Pages) NXP

134 / 374 page

Chapter 10 Analog-to-Digital Converter (S08ADC12V1)

MC9S08JM60 Series Data Sheet, Rev. 5

134

Freescale Semiconductor

NOTE

Selecting the internal bandgap channel requires BGBE =1 in SPMSC1 see

Section 5.7.7, “System Power Management Status and Control 1 Register

(SPMSC1).” For value of bandgap voltage reference see Appendix A.8,

“Analog Comparator (ACMP) Electricals.”

10.1.1.2

Alternate Clock

The ADC is capable of performing conversions using the MCU bus clock, the bus clock divided by two,

the local asynchronous clock (ADACK) within the module, or the alternate clock (ALTCLK). The

ALTCLK on this device is the MCGERCLK.

The selected clock source must run at a frequency such that the ADC conversion clock (ADCK) runs at a

frequency within its specified range (fADCK) after being divided down from the ALTCLK input as

determined by the ADIV bits.

ALTCLK is active while the MCU is in wait mode provided the conditions described above are met. This

allows ALTCLK to be used as the conversion clock source for the ADC while the MCU is in wait mode.

ALTCLK cannot be used as the ADC conversion clock source while the MCU is in stop3.

10.1.1.3

Hardware Trigger

The RTC on this device can be enabled as a hardware trigger for the ADC module by setting the

Table 10-1. ADC Channel Assignment

ADCH

Channel

Input

Pin Control

ADCH

Channel

Input

Pin Control

00000

AD0

PTB0/MISO2/ADP0

ADPC0

10000

AD16

VREFL

N/A

00001

AD1

PTB1/MOSI2/ADP1

ADPC1

10001

AD17

VREFL

N/A

00010

AD2

PTB2/SPSCK2/ADP2

ADPC2

10010

AD18

VREFL

N/A

00011

AD3

PTB3/SS2/ADP3

ADPC3

10011

AD19

VREFL

N/A

00100

AD4

PTB4/KBIP4/ADP4

ADPC4

10100

AD20

VREFL

N/A

00101

AD5

PTB5/KBIP5/ADP5

ADPC5

10101

AD21

Reserved

N/A

00110

AD6

PTB6/ADP6

ADPC6

10110

AD22

Reserved

N/A

00111

AD7

PTB7/ADP7

ADPC7

10111

AD23

Reserved

N/A

01000

AD8

PTD0/ADP8/ACMP+

ADPC8

11000

AD24

Reserved

N/A

01001

AD9

PTD1/ADP9/ACMP-

ADPC9

11001

AD25

Reserved

N/A

01010

AD10

PTD3/KBIP3/ADP10

ADPC10

11010

AD26

Temperature

Sensor1

1 For more information, see Section 10.1.1.5, “Temperature Sensor.”

N/A

01011

AD11

PTD4/ADP11

ADPC11

11011

AD27

Internal Bandgap

N/A

01100

AD12

VREFL

ADPC12

11100

Reserved

N/A

01101

AD13

VREFL

ADPC13

11101

VREFH

N/A

01110

AD14

VREFL

ADPC14

11110

VREFL

N/A

01111

AD15

VREFL

ADPC15

11111

module

disabled

None

N/A

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