MC9S08DN60F1CLF datasheet(165/356 Pages) FREESCALE

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Chapter 9 Analog Comparator (S08ACMPV3)

MC9S08DN60 Series Data Sheet, Rev 3

Freescale Semiconductor

165

9.3

Memory Map/Register Deﬁnition

The ACMP includes one register:

•

An 8-bit status and control register

Refer to the direct-page register summary in the memory section of this document for the absolute address

assignments for the ACMP register.This section refers to register and control bits only by their names and

relative address offsets.

Some MCUs may have more than one ACMP, so register names include placeholder characters (x) to

identify which ACMP is being referenced.

9.3.1

ACMPx Status and Control Register (ACMPxSC)

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

Table 9-2. ACMP Register Summary

Name

76543210

ACMPxSC

ACME

ACBGS

ACF

ACIE

ACO

ACOPE

ACMOD

76543210

ACME

ACBGS

ACF

ACIE

ACO

ACOPE

ACMOD

Reset:

Figure 9-3. ACMPx Status and Control Register (ACMPxSC)

Table 9-3. ACMPxSC Field Descriptions

Field

Description

ACME

Analog Comparator Module Enable. Enables the ACMP module.

0 ACMP not enabled

1 ACMP is enabled

ACBGS

Analog Comparator Bandgap Select. Selects between the bandgap reference voltage or the ACMPx+ pin as the

input to the non-inverting input of the analog comparator.

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

1 Internal reference select as non-inverting input to comparator

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 it.

0 Compare event has not occurred

1 Compare event has occurred

ACIE

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

asserted when ACF is set.

0 Interrupt disabled

1 Interrupt enabled

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