MC9RS08KA2_08 Datasheet, PDF (83/136 Pages) Freescale Semiconductor, Inc – RS08 Microcontrollers

Chapter 10
Analog Comparator (RS08ACMPV1)
10.1 Introduction
The analog comparator module (ACMP) provides a circuit for comparing two analog input voltages or for
comparing one analog input voltage to an internal reference voltage. The comparator circuit is designed to
operate across the full range of the supply voltage (rail to rail operation).
Figure 10-1 shows the MC9RS08KA2 Series block diagram with the ACMP highlighted.
RS08 CORE
BDC
CPU
RS08 SYSTEM CONTROL
RESET AND STOP WAKEUP
MODES OF OPERATION
POWER MANAGEMENT
RTI
COP
WAKEUP
LVD
5-BIT KEYBOARD
INTERRUPT MODULE
(KBI)
ANALOG COMPARATOR
MODULE
(ACMP)
MODULO TIMER
MODULE
(MTIM)
5
ACMP+
ACMP-
TCLK
ACMPO
PTA0/KBIP0/ACMP+ ⁽¹⁾
PTA1/KBIP1/ACMP- ⁽¹⁾
PTA2/KBIP2/TCLK/RESET/V_PP ^{(1),( 2)}
PTA3/ACMPO/BKGD/MS
PTA4/KBIP4 ^(1),(3)
PTA5/KBIP5 ^{(1), (3)}
USER FLASH
MC9RS08KA2 — 2048 BYTES
MC9RS08KA1 — 1024 BYTES
USER RAM — 63 BYTES
INTERNAL CLOCK
SOURCE
(ICS)
V_SS
POWER AND
V_DD
INTERNAL REGULATOR
NOTES:
(1) Pins are software configurable with pullup/pulldown device if input port.
(2) Integrated pullup device enabled if reset enabled (RSTPE=1).
(3) These pins are not available in 6-pin package
Figure 10-1. MC9RS08KA2 Series Block Diagram Highlighting ACMP Block and Pins
MC9RS08KA2 Series Data Sheet, Rev. 4
Freescale Semiconductor
83