MC14489
features data retention plus decode and scan circuitry, thus relieving processor overhead. A single, current- setting resistor is the only ancillary ponent required. A single device can drive any one of the following: a 5- digit display plus decimals, a 4- 1/2- digit display plus decimals and sign, or 25 lamps. A special technique allows driving 5 1/2 digits; see Figure 16. A configuration register allows the drive capability to be partitioned off to suit many additional applications. The on- chip decoder outputs 7- segment- format numerals 0 to 9, hexadecimal characters A to F, plus 15 letters and symbols. The MC14489 is patible with the Motorola SPI and National MICROWIRE™ serial data ports. The chip’s patented Bit Grabber™ registers augment the serial interface by allowing random access without steering or address bits. A 24- bit transfer updates the display register. Changing the configuration register requires an 8- bit transfer.
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