MC68120

® ItIIOTOROLA Advance Information INTELLIGENT PERIPHERAL CONTROLLER The MC68120/MC68121 Intelligent Peripheral Controller (lPCI is a general purpose, mask programmable peripheral controller. The IPC provides the interface between an M68000 or M6800 Family microprocessor and the final peripheral devices through a system bus and control lines. System bus data is transferred to and from the IPC via dual-port RAM while the software utilizes the semaphore registers to control RAM tasking or any other shared resource. Multiple operating I modes range from a single chip mode with 21 I/O lines and 2 control lines to an expanded mode supporting an address space of 64K bytes. The MC68120 has 2K bytes of on-chip ROM to make full use of all operating modes. The MC68121 utilizes only the expanded address modes, due to the absence of on-chip ROM. A serial communications interface, 16-bit timer, dual-ported RAM and semaphore registers are available for use by the IPC in all operating modes. System Bus Compatible with the Asynchronous M68000 Family System Bus Compatible with the MC6809 and Other M6800 Family Processors/ Peripherals Local Bus Allows Interface with all M6800 Peripherals MC6801 Source and Object Code Compatible Upward Compatible with MC6800 Source and Object Code 2048 Bytes of ROM (MC68120 Only) 128 Bytes of Dual-Ported RAM Multiple Operation Modes Ranging from Single Chip to Expanded, with 64K Byte Address Space Six Shared Semaphore Registers 21 Parallel I/...