TK89C668 Microcontroller, 64K Flash, 8K RAM
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The TK89C668 is based on the 8051- microcontroller architecture. With 64Kx8 of Flash memory and 8Kx8 of internal RAM, these parts are a pin-for-pin replacement for existing NXP P89C668 microcontroller.
The TK89C668 contains four 8-bit bidirectional parallel ports, two external interrupt sources, three timer/counters, a serial port with a hardware interrupt capability and a frame error detect flag, power management, a programmable counter array (PCA), TWI Serial Interface, and enhanced data security features. These peripherals are supported by a multiple source, four level interrupt capability. The core processor contains 256 bytes of scratchpad RAM and 64KB of program storage. The core also contains 7936 bytes of Extended RAM.
The TWI (Two Wire Interface) is fully implemented in hardware. This allows byte level transfers, resulting in simpler software overhead.
The data sheet is available here: pdf TK89C668 (361 KB)
The data sheet is available here: pdf TK89C668 Programming Information (292 KB)