The HIP7030A2 HCMOS Microcomputer is a member of the CDP68HC05 family of low-cost single-chip microcomputers. The integrated hardware functions provide the system designer with a complete set of building blocks for implementing a "Class B" multiplexed communications network interface, which fully conforms to the VPW Multiplexed Wiring protocol specified in SAE Recommended Practice J1850. This 8-bit microcomputer unit (MCU) contains an onchip oscillator, CPU, 176 bytes of RAM, 2110 bytes of user ROM, 13 I/O lines, a J1850 Variable Pulse Width Symbol Encoder/Decoder (VPW SENDEC) system, a Serial Peripheral Interface (SPI) system, a two channel analog Comparator, a Watchdog Timer, a Slow Clock Detect, and a 16-bit Timer. The static HCMOS design allows operation at input frequencies up to 10MHz (5MHz internal clock).