General Description

MG84FL54 is an enhanced single-chip 8-bit microcontroller manufactured in an advanced Embedded-Flash process. The instruction set is fully compatible with that of the 8051. With the enhanced CPU core, the device needs only 1 to 7 clock cycles to complete an instruction, and thus provides much higher performance than the standard 8051, which needs 12 to 48 clock cycles to complete an instruction. So, at the same performance as the standard 8051, the device can operate at a much lower speed and thereby greatly reduce the power consumption.

The device has on-chip 16KB Flash memory that is parallel programmable (via a universal programmer), In-System Programmable (via USB DFU). ISP allows the device to alter its own program memory without being removed from the actual end product under software control. This opens up a range of applications that need the ability to field update the application firmware. The other important and useful feature, In-Application-Programming (IAP), provides the device with the ability to save non-volatile data in its Flash memory.

And in addition to the 256 bytes of internal scratch-pad RAM, the device has 576 bytes of on-chip expanded RAM (XRAM) for the applications that require extra memory. The device has also four 8-bit I/O ports and one 4-bit I/O ports, three 16-bit timers/counters, a multi-source/two-priority-level/nested interrupt structure, an enhanced UART input. More important, the added features such as KBI, SPI, TWSI bus and USB1.1 make it a powerful microcontroller and suitable for wide field applications.