SC312XDP512F0MPVR datasheet(178/1348 Pages) FREESCALE

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Chapter 5 Analog-to-Digital Converter (S12ATD10B8CV2)

MC9S12XDP512 Data Sheet, Rev. 2.21

178

Freescale Semiconductor

5.3.2.11

ATD Input Enable Register (ATDDIEN)

Read: Anytime

Write: Anytime

5.3.2.12

Port Data Register (PORTAD)

The data port associated with the ATD can be conﬁgured as general-purpose I/O or input only, as speciﬁed

in the device overview. The port pins are shared with the analog A/D inputs AN7–0.

Read: Anytime

Write: Anytime, no effect

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

76543210

IEN7

IEN6

IEN5

IEN4

IEN3

IEN2

IEN1

IEN0

Reset

00000000

Figure 5-13. ATD Input Enable Register (ATDDIEN)

Table 5-21. ATDDIEN Field Descriptions

Field

Description

7–0

IEN[7:0]

ATD Digital Input Enable on channel x (x = 7, 6, 5, 4, 3, 2, 1, 0) — This bit controls the digital input buffer from

the analog input pin (ANx) to PTADx data register.

0 Disable digital input buffer to PTADx

1 Enable digital input buffer to PTADx.

Note: Setting this bit will enable the corresponding digital input buffer continuously. If this bit is set while

simultaneously using it as an analog port, there is potentially increased power consumption because the

digital input buffer maybe in the linear region.

76543210

PTAD7

PTAD6

PTAD5

PTAD4

PTAD3

PTAD2

PTAD1

PTAD0

Reset

11111111

Function

AN7

AN6

AN5

AN4

AN3

AN2

AN1

AN0

= Unimplemented or Reserved

Figure 5-14. Port Data Register (PORTAD)

Table 5-22. PORTAD Field Descriptions

Field

Description

7–0

PTAD[7:0]

A/D Channel x (ANx) Digital Input (x = 7, 6, 5, 4, 3, 2, 1, 0) — If the digital input buffer on the ANx pin is enabled

(IENx = 1) or channel x is enabled as external trigger (ETRIGE = 1,ETRIGCH[2–0] = x,ETRIGSEL = 0) read

returns the logic level on ANx pin (signal potentials not meeting VIL or VIH speciﬁcations 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 “1”.

Reset sets all PORTAD0 bits to “1”.

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