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ICM7218BIJI Datasheet(PDF) 9 Page - Intersil Corporation |
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ICM7218BIJI Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 11 page 9 FN3159.3 September 15, 2015 Application Examples 8-Digit Microprocessor Display Application Figure 9 shows a display interface using the lCM7218A/B with an 8048 family microcontroller. The 8 bit data bus (DB0/DB7-lD0/ID7) transfers control and data information to the 7218 display interface on successive WRITE pulses. The MODE input to the 7218 is connected to one of the I/O port pins on the microcontroller, When MODE is high a control word is transferred; when MODE is low data is transtered. Sequential locations in the 8-byte static memory are automatically loaded on each successive WRITE pulse. After eight WRITE pulses have occurred, further pulses are ignored until a new control word is transferred (See Figure 5). This also allows writing to other peripheral devices without disturbing the lCM7218A/B. 16-Digit Microprocessor Display In this application (see Figure 10), both lCM7218s are addressed simultaneously with a 3 bit word, DA2-DA0. Display data from the 8048 I/O bus (DB7-D80) is transferred to both lCM7218s simultaneously. The display digits from both lCM7218s are interleaved to allow adjacent pairs of digits to be loaded simultaneously from a single 8 bit data bus. Decimal point information is supplied to the ICM7218s from the processor on port lines P26 and P27. No Decode Application The lCM7218 can also be used as a microprocessor based LED status panel driver. The microprocessor selected control word must include "No Decode" and "Data Coming". The processor writes "Ones" and "Zeroes" into the lCM7218 which in turn directly drives appropriate discrete LEDs. LED indicators can be red or green (8 segments x 8 digits = 64 dots/2 per red or green = 32 channels). FIGURE 9. 8-DIGIT MICROPROCESSOR DISPLAY ICM7218 |
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