VL82C113

The VL82C113 has the following features including 146818A-compatible real-time clods;64 additional bytes of battery-backed CMOS RAM;AT-compatible keyboard controller with integrated PS/2. mouse support;SCAMP-compatible processor to ISA;bus address latches and buffers;Real-time clock relocateable via SA15-SAO address registers;1.0-micron CMOS in a 100-lead MOFP.

The VL82C113 SCAMP Combination I/O chip, when used with VLSI SCAMP chips, allows designers to implement a very cost-effective minimum chip count motherboard. This chip combines a keyboard controller and a real-time clock with the address registers/latches and buffers which are normally required in PC/AT-compatible systems. The VL82C113 features an AT-compatible keyboard controller with integrated PS/2 mouse support and a 146818A-compatible real-time clock. In addition, the VL82C113 has 64 additional bytes of battery-backed CMOS RAM for use in extended system setup.The VL82C113 SCAMP Combination I/O chip combines a keyboard controller and real-time clock (RTC) with the address registers/latches buffers which are normally required in SCAMP-based systems.While the VL82C113 has been optimized for use with the VL82C31 ONL82C311 NL82C311L SCAMP Controllers, its uses are not restricted to this device combination.

The VL82C113 keyboard controller's microcontroller unit (MCU) offers a subset of the instruction set of the 8042, with 8042-like instructions.Enhancements have been made to conditional jumps (jumps may be made between pages). The on-chip ROM is loaded with the code that is required to support the PC/AT and PS/2 command sets and 128 bytes of conversion code. A small amount of scratch-pad RAM is provided as an extension of the MCU register set for the purpose of keyboard to host interfacing.Keyboard serial I/O is handled with hardware implementations of the receiver and transmitter. Both functions depend on an 8-bit timer for time-out detection. Enhanced status reporting is provided in hardware to simpilify error handling in software. This logic is duplicated for the mouse interface.User RAM VL82C113 support is provided. The program writes the 5-bit address (32-byte range) to a register, and then reads or writes the data through accesses to another register, port 60h DBB.