SH68689 Keyboard Controller Features „ Built-in 6502 8-bit CPU „ 2MHz CPU operation frequency „ 8K bytes of ROM „ 160 bytes of SRAM „ One 8-bit programmable base timer with 1 - 256 µsec interval „ 29 programmable bi-directional I/O pins „ 3 LED direct sink pins with internal serial resistors „ Built-in RC oscillator with an external resistor „ Mask option for DATA/CLK and I/O Port driving capability „ Watch-dog timer „ Built-in power-on reset „ Built-in low voltage reset „ CMOS technology for low power consumption „ Available in CHIP FORM General Description SH68689 is a single chip micro-controller for keyboard applications.
It incorporates a 6502 8-bit CPU core, 8K bytes of ROM and 160...

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