16-bit Microcontrollers
MC9S12A128
Target Applications
> Instrumentation
> Energy management
> Industrial control
> Robotics
> Safety equipment
> Security
Features
High-Performance 16-bit HCS12 CPU Core
Benefits
> 25 MHz bus operation at 5V for 40 ns
minimum instruction cycle time
> Opcode compatible with the 68HC11
and 68HC12
> C-optimized architecture produces extremely
compact code
On-Chip Debug Interface
> Dedicated serial debug interface
> On-chip breakpoints
Overview
Freescale Semiconductor’s MC9S12A128
Flash microcontroller (MCU) is the next
generation of the highly successful
68HC12 architecture. Using Freescale’s
industry-leading 0.25 µs Flash, the A128 is
part of a pin-compatible family that scales
from 32 KB to 512 KB of Flash memory.
The MC9S12A128 provides an upward
migration path from Freescale’s 68HC08,
68HC11 and 68HC12 architectures for
applications that need larger memory,
more peripherals and higher performance.
Integrated Third-Generation Flash Memory
> Real-time in-circuit emulation and debug
without expensive and cumbersome
box emulators
> Read/write memory and registers while running
at full speed
> In-application reprogrammable
> Self-timed, fast programming
• Fast Flash page erase—20 ms
(512 bytes)
• Can program 16 bits in 20 µs while
in burst mode
> 5V Flash program/erase/read
> Flash granularity—512 byte Flash
erase/2 byte Flash program
> Two independently programmable
Flash arrays
> Flexible block protection and security
2 KB Integrated EEPROM
> Flexibility to change code in the field
> Efficient end-of-line programming
> Total program time for 128 KB code is less
than five seconds
> Reduces production programming cost
through ultra-fast programming
> No external high voltage or charge
pump required
> Virtual EEPROM implementation, Flash array
usable for EE extension
> Can erase one array while executing code
from another
HCS12 CPU
128 KB Flash
2 x SCI
8 KB RAM
I
2
C
2 x SPI
Up to
91 GPIO
Vreg
5V to 2.5V
16-Key Wake-Up
IRQ Ports
PWM
8-bit, 8-ch./16-bit, 4-ch.
ATD0
10-bit, 8-ch.
ATD1
10-bit, 8-ch.
2 KB EEPROM
> Flexible protection scheme for protection
against accidental program or erase
> EEPROM can be programmed in 46 µs
10-bit Analog-to-Digital Converter (ADC)
> Can erase 4 bytes at a time and program
2 bytes at a time for calibration, security,
personality and diagnostic information
> Two, 8-channel ADCs
> 7 µs, 10-bit single conversion time, scan mode
available
> Fast, easy conversion from analog inputs
like position sensors, analog meters and
photovoltaic cells to digital values for
CPU processing
> Can effectively have 3.5 µs conversion time
by sampling same signal with both ADCs
Internal Bus
Enhanced Capture Timer
16-bit, 8-ch.
Data Sheets
Features
Benefits
S12DT128DGV2
S12DT128PIMV1
S12ATD10B8CV2
S12BDMV4
S12BKVD1
S12CPUV2
S12CRGV3
MC9S12A128 Device Guide
MC9S12A128 Port Integration Module
Block Guide
HCS12 10-bit 8-channel Analog to
Digital Block Guide
HCS12 Background Debug (BDM)
Block Guide
HCS12 Breakpoint (BKP) Block Guide
HCS12 CPU Reference Manual
HCS12 Clock Reset Generator
Block Guide
HCS12 2K EEPROM Block Guide
HCS12 128K Flash Block Guide
HCS12 I
2
C Block Guide
HCS12 Interrupt (INT) Block Guide
HCS12 Multiplexed External Bus
Interface (MEBI) Block Guide
HCS12 Module Mapping Control
(MMC) Block Guide
HCS12 8-bit 8-channel Pulse-Width
Modulator Block Guide
HCS12 Serial Communications
Interface Block Guide
HCS12 Serial Peripheral Interface
Block Guide
HCS12 16-bit 8-channel Timer
Block Guide
HCS12 Voltage Regulator Block Guide
Clock Generation Module with Phase-Lock Loop (PLL)
> Clock monitor with limp home mode in case of
no external clock
> Programmable clock frequency with 1024
options ranging from divide by 16 to multiply
by 64 form base oscillator
> Real-time interrupt
> Watchdog
> Reliable, robust operation
> Provides high performance using low-cost
reference crystals
> Reduces generated noise
> Reduces power consumption
> Easily able to implement real-time clock
S12EETS2KV1
S12FTS128KV1
Enhanced Capture Timer
S12IICV2
> 8-channel, 16-bit with input capture, output
compare and pulse accumulator
> 16-bit modulus down counter
> Flexible, programmable timer system
S12INTV1
S12MEBIV3
S12MMCV4
S12PWM8B8CV1
8-bit or 16-bit Pulse-Wide Modulation (PWM)
> 8-channel, 8-bit or 4-channel, 16-bit PWM
> PWM supports center-aligned operation
> Efficiently implement motor control, battery
charging or digital-to-analog (DAC) functions
S12SCIV2
S12SPIV2
S12TIM16B8CV1
Two Serial Communications Interfaces
> 8192 prescaler option
> Asynchronous communication between the
MCU and a terminal, computer or
a network of MCUs
S12VREGV1
Cost-Effective Development Tools
Two Serial Peripheral Interfaces
> 256 clock rate options
> High-speed synchronous communication
between multiple MCUs or between MCU and
serial peripherals
For more information on development tools, please refer to
the Freescale Development Tool Selector Guide (SG1011).
M68KIT912DP256
$495
Evaluation kit for development and
evaluation of HCS12 application
code that includes the
M68EVB912DP256 and
USBMULTILINKBDM
HC08/HCS08/HC12/HCS12
stand-alone Flash programmer or
in-circuit emulator, debugger, Flash
programmer; USB, serial or Ethernet
interface options
Inter IC (I
2
C) Bus
> Provides a simple, efficient method
of data exchange between devices
> Minimizes the need for large numbers
of connections between devices and
eliminates the need for an address decoder
M68CYCLONEPRO
$499
USBMULTILINKBDM
Universal HCS08/HCS12 in-circuit
$99
emulator, debugger, and Flash
programmer; USB PC interface
CWX-H12-SE
Free
CodeWarrior™ Special Edition for
HCS12 MCUs; includes integrated
development environment (IDE),
linker, debugger, unlimited
assembler, Processor Expert™
auto-code generator, full-chip
simulation and limited C compiler
Up to 91 Input/Output (I/O) Lines
> Programmable pull-ups/pull-downs
> Dual drive capability
> Reduce system cost
> Able to tailor application for minimum EMC or
high current loads
Application Notes and Engineering Bulletins
AN2206
AN2213
AN2216
AN2250
EB386
Security and Protection on the HCS12 Family
Using Cosmic Software’s M68HC12 Compiler for MC9S12DP256 Software Development
MC9S12DP256 Software Development Using Metrowerks CodeWarrior™
Audio Reproduction on HCS12 Microcontrollers
HCS12 D-Family Compatibility
Package Options
Part Number
MC9S12A128CFU
MC9S12A128CPV
80-Lead LQFP
Package
80 QFP
112 LQFP
Temp. Range
-40°C to +85°C
-40°C to +85°C
112-Lead LQFP
Learn More:
For more information about Freescale products, please visit
www.freescale.com.
Freescale™ and the Freescale logo are trademarks of Freescale Semiconductor, Inc. All other product or service names
are the property of their respective owners. This product incorporates SuperFlash
®
technology licensed from SST.
© Freescale Semiconductor, Inc. 2005
Document Number: MC9S12A128FS
REV 4
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