MC9S12G Datasheet, PDF (216/1160 Pages) Freescale Semiconductor, Inc – Ignores external trigger. Performs one conversion sequence and stops.

5V Analog Comparator (ACMPV1)
digital
input
buffer
ACMPP
+
ACMPM
_
ACDIEN
ACE
ACO
Control & Status
Register
ACIE
ACIF
ACOPE
ACICE
INTERNAL BUS
ACMP IRQ
ACMOD
SET ACIF
Hold Sync
Interrupt
Control
To Input
Capture
Channel
ACMPO
Figure 3-1. ACMP Block Diagram
Figure 3-2.
3.4 External Signals
The ACMP has two analog input signals, ACMPP and ACMPM, and one digital output, ACMPO. The
associated pins are defined by the package option.
The ACMPP signal is connected to the non-inverting input of the comparator. The ACMPM signal is
connected to the inverting input of the comparator. Each of these signals can accept an input voltage that
varies across the full 5V operating voltage range. The module monitors the voltage on these inputs
independent of any other functions in use (GPIO, ADC).
The raw comparator output signal can optionally be driven on an external pin.
3.5 Modes of Operation
1. Normal Mode
The ACMP is operating when enabled and not in STOP mode.
2. Shutdown Mode
The ACMP is held in shutdown mode either when disabled or during STOP mode. In this case the
supply of the analog block is disconnected for power saving. ACMPO drives zero in shutdown
mode.
MC9S12G Family Reference Manual, Rev.1.01
216
Freescale Semiconductor
This document is valid for the S12G96 and the S12G128 device. All information related to other devices is preliminary.