SC9RS08KA2 datasheet(86/134 Pages) FREESCALE

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Analog Comparator (RS08ACMPV1)

SC9RS08KA2 Series Data Sheet, Rev. 1

Freescale Semiconductor

10.2

External Signal Description

The ACMP has two analog input pins, ACMP+ and ACMP–, and one digital output pin, ACMPO. Each

of the input pins can accept an input voltage that varies across the full operating voltage range of the MCU.

As shown in Figure 10-2, the ACMP– pin is connected to the inverting input of the comparator, and the

ACMP+ pin is connected to the non-inverting input of the comparator if ACBGS=0. As shown in

Figure 10-2, the ACMPO pin can be enabled to drive an external pin.

The signal properties of ACMP are shown in Table 10-1.

10.3

The ACMP includes one register:

•

An 8-bit status and control register

Refer to the direct-page register summary in the memory chapter of this data sheet for the absolute address

assignments for all ACMP registers.

10.3.1

ACMP Status and Control Register (ACMPSC)

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

Table 10-1. Signal Properties

Signal

Function

I/O

ACMP-

Inverting analog input to the ACMP

(Minus input)

ACMP+

Non-inverting analog input to the ACMP

(Positive input)

ACMPO

Digital output of the ACMP

765

210

ACME

ACBGS

ACF

ACIE

ACO

ACOPE

ACMOD

Reset:

000

= Unimplemented

Figure 10-3. ACMP Status and Control Register (ACMPSC)

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