MC9S08DZ60 Datasheet, PDF (163/396 Pages) Freescale Semiconductor, Inc – Microcontrollers

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 8-1, 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 8-1,
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.
I
(Minus input)
ACMPx+ Non-inverting analog input to the ACMP.
I
(Positive input)
ACMPxO Digital output of the ACMP.
O
9.3 Register Definition
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 the ACMP register.This section refers to register and control bits only by their names and
relative address offsets.
Some MCUs may have more than one ACMP, so register names include placeholder characters to identify
which ACMP is being referenced.
MC9S08DZ60 Series Data Sheet, Rev. 1 Draft E
Freescale Semiconductor
PRELIMINARY
163
Subject to Change