MC9S08DZ96F2CLL datasheet(204/458 Pages) FREESCALE

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Chapter 9 Analog Comparator (S08ACMPV3)

MC9S08DZ128 Series Data Sheet, Rev. 1

204

Freescale Semiconductor

9.3.1.1

ACMPx Status and Control Register (ACMPxSC)

ACMPxSC contains the status ﬂag and control bits which are used to enable and conﬁgure the ACMP.

76543210

ACME

ACBGS

ACF

ACIE

ACO

ACOPE

ACMOD

Reset:

= Unimplemented

Figure 9-3. ACMPx Status and Control Register

Table 9-2. ACMPx Status and Control Register Field Descriptions

Field

Description

ACME

Analog Comparator Module Enable — ACME enables the ACMP module.

0 ACMP not enabled

1 ACMP is enabled

ACBGS

Analog Comparator Bandgap Select — ACBGS is used to select between the bandgap reference voltage or

the ACMPx+ pin as the input to the non-inverting input of the analog comparatorr.

0 External pin ACMPx+ selected as non-inverting input to comparator

1 Internal reference select as non-inverting input to comparator

Note: refer to this chapter introduction to verify if any other conﬁg bits are necessary to enable the bandgap

reference in the chip level.

ACF

Analog Comparator Flag — ACF is set when a compare event occurs. Compare events are deﬁned by ACMOD.

ACF is cleared by writing a one to ACF.

0 Compare event has not occured

1 Compare event has occured

ACIE

Analog Comparator Interrupt Enable — ACIE enables the interrupt from the ACMP. When ACIE is set, an

interupt will be asserted when ACF is set.

0 Interrupt disabled

1 Interrupt enabled

ACO

Analog Comparator Output — Reading ACO will return the current value of the analog comparator output. ACO

is reset to a 0 and will read as a 0 when the ACMP is disabled (ACME = 0).

ACOPE

Analog Comparator Output Pin Enable — ACOPE is used to enable the comparator output to be placed onto

the external pin, ACMPxO.

0 Analog comparator output not available on ACMPxO

1 Analog comparator output is driven out on ACMPxO

1:0

ACMOD

Analog Comparator Mode — ACMOD selects the type of compare event which sets ACF.

00 Encoding 0 — Comparator output falling edge

01 Encoding 1 — Comparator output rising edge

10 Encoding 2 — Comparator output falling edge

11 Encoding 3 — Comparator output rising or falling edge

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