MM908E622ACEK

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The MM908E622ACEK is an 8-bit, low power, enhanced HCS08 central processor unit (CPU) module. It is well suited for a variety of demanding embedded applications. It integrates the RISC architecture core with HCS08 instruction set, 32K Bytes of Flash memory, 16K Bytes of RAM, and peripheral features including 5 channel 16 bit timer, 3 channel analog-to-digital converter, real-time debug module, watchdogs, and data retention support. The MM908E622ACEK is designed to operate up to 32MHz with low power consumption which makes it suitable for handheld battery operated equipment.

Application Field

The MM908E622ACEK has the flexibility, performance and low power consumption design to fit into consumer, automotive, and industrial applications. Its entry-level price and efficient power management result in an ideal choice for developing cost effective and power efficient applications. It can be used for applications such as battery-powered, safety critical control systems, sensor and lighting control, remote sensing, and portable/handheld systems.

Working Principle

The working principle of the MM908E622ACEK is based on the HCS08 core architecture. It provides instruction set compatibility, allowing the reuse of software developed for the HCS08 and HCS12 microcontroller families, while preserving upward compatibility with higher performance MCUs. It has six 8-bit general purpose registers, three 16-bit index registers, stack pointer and program counter, along with various condition codes and other flags that facilitate interrupt handling. The on-chip peripheral set includes four 16-bit timers, three-channel 8-bit analog-to-digital converter, master clock controller, clock generation module, LCD and serial ports, I/O ports, and watchdog timer.

The MM908E622ACEK also offers rich debug features such as real-time debug module, which gives developers the ability to debug their code in real time without using an external memory mapping. The on-chip trace capability allows developers to trace through the code path, helping them to quickly identify performance issues. The device also offers an integrated data retention feature, allowing developers to store application data during low power and hibernation operations.

The MM908E622ACEK is designed to minimize system power consumption and extend the battery life of portable devices. It has a dedicated clock and voltage converter for each individual module to minimize power consumption, and supports several power saving modes. For example, the Idle mode reduces the clock frequency to conserve power. In addition, the Sleep mode completely shuts down the CPU and most peripherals, while keeping RAM data and peripherals functional.

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