HCS08 datasheet(122/374 Pages) NXP

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Analog Comparator (S08ACMPV2)

MC9S08JM60 Series Data Sheet, Rev. 5

122

Preliminary

Freescale Semiconductor

Figure 8-2. Analog Comparator 5V (ACMP5) Block Diagram

8.2

External Signal Description

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

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

shown in Figure 8-2, the ACMP– pin is connected to the inverting input of the comparator, and the

ACMP+ pin is connected to the comparator non-inverting input if ACBGS is a 0. As shown in Figure 8-2,

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

The signal properties of ACMP are shown in Table 8-1.

8.3

Memory Map

8.3.1

The ACMP includes one register:

Table 8-1. 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.

Interrupt

Control

Internal

Reference

ACBGS

Internal Bus

Status & Control

ACME

ACF

ACIE

ACOPE

Comparator

ACMP

INTERRUPT

REQUEST

ACMP+

ACMP–

ACMPO

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