HCS08 datasheet(115/316 Pages) NXP

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Analog Comparator (S08ACMPV2)

MC9S08SG8 MCU Series Data Sheet, Rev. 8

Freescale Semiconductor

115

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:

•

An 8-bit status and control register

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

assignments for all ACMP registers.This section refers to registers and control bits only by their names .

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

which ACMP is being referenced.

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.

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