■ DESCRIPTION
The MB90F244 is a 16-bit microcontroller optimized for applications in mechatronics such as HDD units. The architecture of the MB90F244 is based on the MB90242A, and embedded with a 128-Kbyte flash memory.
The instruction set is based on the AT architecture of the F2MC* family, with additional high-level language supporting instruction, expanded addressing modes, enhanced multiplication and division instructions, and improved bit processing instructions. In addition, long-word data can now be processed due to the inclusion of a 32-bit accumulator.

■ FEATURES
• Minimum execution time (target): 40.0 ns at 50 MHz oscillation (3.3 V ±0.3 V)
• Instruction set optimized for controller applications
    Variety of data types: bit, byte, word, long-word
    Expanded addressing modes: 25 types
    High coding efficiency
    Improvement of high-precision arithmetic operations through use of 32-bit accumulator
    Enhanced multiplication and division instructions (signed arithmetic operations)
• Instruction set supports high-level language (C language) and multitasking
    Inclusion of system stack pointer
    Variety of pointers
    High instruction set symmetry
    Barrel shift instruction
    Stack check function
• Improved execution speed: 8-byte queue
• Powerful interrupt functions
    Interrupt processing time: 0.64 µs at 50 MHz oscillation
    Priority levels: 8 levels (programmable)
    External interrupt inputs: 4 channels
• Automatic transfer function independent of CPU
    Extended intelligent I/O service: Max.15 channels
• 128-Kbyte flash memory
    Access time (min.) : 80 ns
    Sector structure of 16K + 512 × 2 + 7K + 8K + 32K + 64K
    Program/erase operations from both EPROM programmer and CPU through built-in flash memory interface
    circuit
    Built-in programming booster circuit for flash memory
• Internal RAM: 1.152 kbyte
    According to mode settings, data stored on RAM can be executed as CPU instructions.
• General-purpose ports: Max. 63 channels (single-chip mode)
                                         Max. 38 channels (external bus mode)
• 18-bit timebase timer
• Watchdog timer
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