MC9S12KG128_10 Datasheet, PDF(243/606 Page) Freescale Semiconductor, Inc – HCS12 Microcontrollers

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MC9S12KG128_10 Datasheet, PDF (243/606 Pages) Freescale Semiconductor, Inc – HCS12 Microcontrollers

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Chapter 7 Analog-to-Digital Converter (ATD10B16CV3) Block Description

7.3.2.15 Port Data Register 1 (PORTAD1)

The data port associated with the ATD is input-only. The port pins are shared with the analog A/D inputs

AN7-0.

R

W

Reset

Pin

Function

7

PTAD7

1

AN 7

6

PTAD6

5

PTAD5

4

PTAD4

3

PTAD3

2

PTAD2

1

1

1

1

1

AN6

AN5

AN4

AN3

AN2

= Unimplemented or Reserved

Figure 7-17. Port Data Register 1 (PORTAD1)

Read: Anytime

Write: Anytime, no effect

The A/D input channels may be used for general-purpose digital input.

Table 7-26. PORTAD1 Field Descriptions

1

PTAD1

1

AN1

0

PTAD0

1

AN0

Field

7:0

PTAD[7:8]

Description

A/D Channel x (ANx) Digital Input Bits â If the digital input buffer on the ANx pin is enabled (IENx=1) or

channel x is enabled as external trigger (ETRIGE = 1, ETRIGCH[3-0] = x, ETRIGSEL = 0) read returns the

logic level on ANx pin (signal potentials not meeting VIL or VIH speciï¬cations will have an indeterminate value)).

If the digital input buffers are disabled (IENx = 0) and channel x is not enabled as external trigger, read returns

a â1â.

Reset sets all PORTAD1 bits to â1â.

MC9S12KG128 Data Sheet, Rev. 1.16

Freescale Semiconductor

243

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