■ 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

(Continue ...)