MC9S08DN60F1CLF datasheet(164/356 Pages) FREESCALE

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Chapter 9 Analog Comparator (S08ACMPV3)

MC9S08DN60 Series Data Sheet, Rev 3

164

Freescale Semiconductor

9.1.4

Block Diagram

The block diagram for the analog comparator module is shown Figure 9-2.

Figure 9-2. Analog Comparator (ACMP) Block Diagram

9.2

External Signal Description

The ACMP has two analog input pins, ACMPx+ and ACMPx

− and one digital output pin ACMPxO. Each

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

As shown in Figure 9-2, the ACMPx- pin is connected to the inverting input of the comparator, and the

ACMPx+ pin is connected to the comparator non-inverting input if ACBGS is a 0. As shown in Figure 9-2,

the ACMPxO pin can be enabled to drive an external pin.

The signal properties of ACMP are shown in Table 9-1.

Table 9-1. Signal Properties

Signal

Function

I/O

ACMPx-

Inverting analog input to the ACMP.

(Minus input)

ACMPx+

Non-inverting analog input to the ACMP.

(Positive input)

ACMPxO

Digital output of the ACMP.

Interrupt

Control

Internal

Reference

ACBGS

Internal Bus

Status & Control

ACME

ACF

ACIE

ACOPE

Comparator

ACMPx

INTERRUPT

REQUEST

ACMPx+

ACMPx-

ACMPxO

MC9S08DN60F1CLF Datasheet(PDF) 164 Page - Freescale Semiconductor, Inc

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