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The HCS12 Family of microcontrollers is the next generation of the highly successful 68HC12 architecture.Utilizing Motorola’s industry-leading 0.25µ FLASH, the HCS12 is a pin-compatible family that is planned to scale from 32 Kbytes to 512 Kbytes of FLASH memory. The DP256 provides an upward migration path from Motorola’s 68HC08, 68HC11 and 68HC12 architectures for applications that need larger memory, more peripherals and higher performance. Also, with the increasing number of CAN/J1850-based
ECUs, its multiple network modules support this environment by enabling highly efficient communications between different network buses.
Features:
HIGH-PERFORMANCE 16-BIT HCS12 CPU CORE
 | 25 MHz bus operation at 5V for 40 nsec 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 |
| Real-time in-circuit emulation and debug without expensive and cumbersome “box” emulators |
| Read/write memory and registers while running at full speed |
NETWORK MODULES
| Five msCAN Modules implementing the CAN 2.0 A/B protocol |
- Five receive buffers per module with FIFO storage scheme
- Three transmit buffers per module with internal prioritization
| One J1850 Module |
| Ability to link modules for higher buffer count |
| Programmable bit rate up to 1 Mbps |
| FIFO receive approach superior for event driven networks |
| Ability to send and receive messages across an SAE J1850 serial communication network |
INTEGRATED THIRD-GENERATION FLASH MEMORY
| In-application re-programmable |
| Self-timed, fast programming |
- Fast FLASH Page Erase
- 20 msec(512 Bytes)
- Can program 16 bits in 20 µsec while in burst mode
| 5V FLASH program/erase/read |
| FLASH granularity |
- 512 byte FLASH erase / 2 byte FLASH program
| Four independently programmable FLASH Arrays |
| Flexible block protection and security |
| Flexibility to change code in the field |
| Efficient end-of-line programming |
| Total program time for 256 Kbyte code is less than 10 sec |
| 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 |
4 KBYTES INTEGRATED EEPROM
| Flexible protection scheme for protection against accidental program or erase |
| EEPROM can be programmed in 46 µsec |
| Can erase 4 bytes at a time and program 2 bytes at a time for calibration, security,personality and diagnostic information |
10-BIT ANALOG-TO-DIGITAL CONVERTER
| Two 8-channel A/D converters |
| 7µsec, 10-bit single conversion time, scan mode available |
| Fast, easy conversion from analog inputs like temperature, pressure and fluid levels to digital values for CPU processing |
| Can effectively have 3.5 µsec conversion time by sampling same signal with both A/D converters |
CLOCK GENERATION MODULE WITH PLL
| Clock monitor with self clock mode in case of no external clock |
| Programmable clock frequency with 1024 options ranging from divide by 16 to multiply by 64 from 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 |
ENHANCED CAPTURE TIMER
| 8-channel 16-bit with input capture, output compare and pulse accumulator |
| 16-bit modulus down counter |
| Flexible, programmable timer system |
8-BIT OR 16-BIT PULSE-WIDE MODULATION
| 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 functions |
TWO SERIAL COMMUNICATIONS INTERFACES
| 8192 Prescalar option · Asynchronous communication between the MCU and a terminal, computer or a network of microcontrollers |
| Exact baud rate matching |
THREE SERIAL PERIPHERAL INTERFACES
| Up to 6.25 Mbps |
| High-speed synchronous communication between multiple MCUs or between MCU and serial peripherals |
INTER IC BUS (I2C)
| 256 clock rate options · 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 |
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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 |
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