The MC145003/5004 are 128segment, multiplexedbyfour LCD Drivers. The two devices are functionally the same except for their data input protocols. The MC145003 uses an SPI data input protocol which is directly compatible with that of the MC6805 family of microcomputers. Using a minimal amount of software (see example), the device may be interfaced to the MC68HCXX product families. The MC145004 has a IIC interface and has essentially the same protocol, except that the device sends an acknowledge bit back to the transmitter after each eightbit byte is received. MC145004 also has a "read mode", whereby data sent to the device may be retrieved via the IIC bus.