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CENTRAL PROCESSING UNIT
The M68HC11 CPU is optimized for low power consumption and
high-performance operation at bus frequencies up to 4 MHz.
- Two 8 bit or one 16-bit accumulator
- Two 16-index registers
- Powerful bit-manipulation instructions
- Six powerful addressing modes (Immediate, Extended, Indexed, Inherent, and Relative)
- Power saving STOP and WAIT modes
- Memory mapped 1/0 and special functions
- 16x16 integer and fractional divides
- 8x8 multiply
The M68HC11 Family leads in microcontroller memory technology.
In fact, the 68HC711E9 was the first device to integrate EPROM
and EEPROM technologies on the same chip.
The M68HC11 Family on chip memory technology offers:
- Fully static designed RAM
- One time programmable and windowed EPROM
- Secure storage EEPROM
- Expanded bus memory interfaces
- 4 channel direct memory access
In many applications, the M68HC11 provides a single chip solution
with mask programmed ROM or user-programmable EPROM. All family
derivatives are also expandable for the incorporation of external
memory in the design. In addition to the standard 64 Kbytes of
address space, many devices offer up to six additional memory
expansion to access more than 1 Mbyte.
The M68HC11 Family's RAM uses a fully static design, and the
contents can be preserved during periods of processor inactivity.
One Time Programmable (OTP) and windowed EPROM versions of
M68HC11 devices are offered across the family providing a cost
effective, user-programmable ROM facility for small volume
prototypes and development runs.
Secure EPROM devices are also available for applications where code is
at risk of being compromised
The M68HC11's EEPROM is ideal for the secure storage of essential
calibration, diagnostic and security information.
A 4 channel Direct Memory Access (DMA) unit on some devices
permits fast data transfer between two blocks of memory (including
externally mapped memory in expanded mode), between registers or
between registers and memory.
The M68HC11 Family provides on chip serial communication interfaces
supporting a broad range of applications, and data transfer to both
local and remote peripherals. Both the synchronous Serial Peripheral
Interface (SPI) and asynchronous Serial Communications Interface
(SCI) have a wide range of software selectable baud rates and are
optimized to minimize CPU overhead.
The SCI features a full duplex Universal Asynchronous Receiver/
Transmitter system, using the non-return-to zero (NRZ) format for
microcontroller-to PC connections, or to form a serial communications
network connecting several widely distributed microcontrollers.
Through the SCI, the built-in bootstrap interface allows in-circuit
programming, and facilitates diagnostic and test operation of your
The SPI is capable of inter-processor communication in a - _ multiple master
system. The SPI also enables synchronous communication between the
microcontroller and peripheral , devices such as:
- Shift registers
- Liquid Crystal Display (LCD) drivers
- Analogto Digital Converters
- Other microprocessors
LOW POWER OPERATION
The M68HC11 provides high performance at low power. Further power
reductions can be achieved by some devices which have a Phase
Locked Loop (PLL) clock synthesizer circuit.
The PLL allows clock speed reduction by switching the internal
clock to a lower, power saving frequency.
Additional low power operation features include:
- More than 25 derivatives that operate in applications with supply voltages ranging from 3.0 5.5V
- Extended voltage versions operate identically to standard devices,
- and are ideal for battery powered, hand-held applications, remote
- sensors and actuators
- The core supports two software selectable low power modes,
- STOP and WAIT
- Some versions operate as low as 2.7V
HIGH PERFORMANCE TIMER
The industry standard M68HC11 timer provides flexibility, performance and ease of use.
The system is based on a free-running 16-bit counter with a programmable prescaler,
overflow interrupt, and separate function interrupts.
Additional M68HC11 timer features include:
It also provides a selection of timer sub systems geared towards
timing-intensive applications; each supported by additional features
associated with specific family members, including:
- Fixed periodic rate interrupts
- Computer Operating Properly (COP) protection against software failures
- Pulse accumulator for external event counting or gated time accumulation
- An optional PWM offering up to six channels and up to 16 bit PWM outputs
- Optional event counter system for advanced timing operations
- Multiple input capture functions and multiple output compares
- Input Captures
- Output Compares
- Real-Time Interrupt
- Pulse Accumulator
- Watchdog function
A/D systems are available with 8 to 12 channels and 8 and 10 bit resolution.
The A/D is software programmable to provide single or continuous conversion modes.
The M68HC11 Family now also offers D/A conversion for added versatility.
PULSE WIDTH MODULATION
The M68HC11 Family offers a selection of Pulse Width Modulation
(PWM) options to support a variety of applications. Up to six PWM
channels can be selected to create continuous waveforms with
programmable rates and software selectable duty cycles from 0
MEMORY MANAGEMENT AND CHIP SELECTS
The 68HCllK4 and 68HCllCO are two devices in the family that
offer memory expansion logic. The Memory Management Units
(MMU) implement additional address lines that are active only
when required by the CPU; the Chip Select block provides signals
to simplify the interface to external devices.
MORE THAN 50 MEMBERS MAKE UP THE M68HC11 FAMILY
Within the M68HC11 Family, there are nine major series of micro
controller units; each is composed of many related devices. The
following are examples of the features the M68HC11 can offer as
shown through specific devices within each series:
The 68HC11A8 is an advanced 8 bit MCU featuring 8 Kbytes
ROM, 256 bytes of RAM. 512 bytes of EEPROM, sophisticated on
chip peripheral and a nonimal bus speed of 3 MHz.
Included is an eight channel A/D converter with eight bits of
The 68HC11D3 chip with 4 Kbytes ROM offers an economical
alternative for applications when advanced 8-bit performance is
required with fewer peripherals and less memory.
In this series, the 68HC11E9's extremely flexible I/0
capability allows facilities to be configured to best match the
application. It was the first in the family to combine EEPROM and
EPROM on a single chip. The E-series offers multiple memory sizes in a
pin compatible package.
High-speed expanded systems required the development of the 68HC11Fl.
This particular chip series stands out with its extra l/O ports, an increase in
static RAM (1 Kbyte), chip selects, and a 4 MHz
The 68HC11G5 is the first family member to offer 10 bit A/D
resolution This series also includes the most sophisticated timer
systems in the family.
Of these very high performance devices, the 68HC11K4
offers high speed, large memories, an MMU, PWMs and plenty of 1/0.
The 68HC11L6 is a high-speed, low-power chip with a
multiplexed bus capable of operation up to 3 MHz. The L6's high
performance design is based on the 68HCllE9. It includes 16 Kbytes
of ROM, plus an additional bidirectional port. Its fully static design
allows operation at frequencies down to dc.
These enhanced, high-performance microcontrollers are
derived from the 68HCllK4 and include large memory modules, a 16
bit math coprocessor, and 4 channels of DMA.
The 68HC11P2 offers a power saving programmable PLL-
based clock circuit along with many 1/0 pins, large memory and 3 SCI
All M68HC11 Family members have on chip SCI and SPI, and most
have EEPROM and an A/D converter.
The M68HC11 Family is supported by dozens of independent
development tool suppliers with a variety of hardware and software
development tools including: emulators, logic analyzers, programmers,
evaluation boards, simulators, C compilers, real-time operating
systems, assemblers, and debuggers - all allowing you to effeciently
develop, monitor, test and debug your code to get your applications up
and running fast.
Hardware tools from Motorola include:
A real-time in-circuit emulator, bus state analyzer and control station
for debugging hardware and software of 68HCll-based systems.
M C U - SPECIFIC EVALUATION SYSTEMS ( E V S )
The EVS is a two-board system consisting of a 68HC11 Plafform Board
(PFB) and an Emulator Module (EM) which contains the control circuits
and a 68HC11 MCU for the part or series of parts being emulated.
The EMs can be used with both the M68MMDS11 and the M68HC11EVS.
EVSs provide expanded-mode, special test, and single chip mode emulation;
is, a dual 64 Kbyte memory map with 64 Kbytes of emulation, and an RS 232 port.
THE M68SPGMR11 SERIAL PROGRAMMER
Program your own code into 68HC11 microcontrollers with on chip
EPROM and EEPROM. Programming software is included. A variety of
easily interchangeable programming adapters for use with different
microcontrollers and packages are available.
EVALUATION BOARDS (EVB)
Our low cost EVBs debug code under the Bit User Fast Friendly Aid to
Logical Operations (BUFFALO) monitor/debugging program contained
in the microcontroller ROM. The EVB has no EPROM programmer. The
EVBU, a condensed "universal" version of the EVB, emulates only
single chip mode operations and includes a wire-wrap area for custom
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Last updated: June 18, 1996