HCS08 datasheet(116/316 Pages) NXP

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Analog Comparator (S08ACMPV2)

MC9S08SG8 MCU Series Data Sheet, Rev. 8

116

Freescale Semiconductor

8.3.1.1

ACMP Status and Control Register (ACMPSC)

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

765

210

ACME

ACBGS

ACF

ACIE

ACO

ACOPE

ACMOD

Reset:

000

= Unimplemented

Figure 8-3. ACMP Status and Control Register

Table 8-2. ACMP 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 ACMP+ pin as the input to the non-inverting input of the analog comparatorr.

0 External pin ACMP+ 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, ACMPO.

0 Analog comparator output not available on ACMPO

1 Analog comparator output is driven out on ACMPO

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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