SL8X305

• Fetch, Decode, and Execute a 16-bit Instruction in a minimum of 200ns (one machine cycle)
• Bit-oriented instruction set (addressable single or multiple-bit subfields)
• Separate buses for instruction, instruction Address and 3 State I/O
• Thirteen 8-bit general-purpose working registers
• Source/destination architecture
• Bipolar low-power Schottky technology/TTL inputs and outputs
• Onchip oscillator and timing generation
• Single +5V supply
• Multiple package options

The Signetics SL8X305 Microcontroller (Figure 1) is a highspeed bipolar microprocessor implemented with lowpower Schottky technology. In a single chip, the 8X305 combines speed, flexibility, and a bitoriented instruction set. These features and other basic characteristics of the chip combine to provide costeffective solutions for a broad range of applications. The 8X305 is particularly useful in systems that require highspeed bit manipulations - sophisticated controllers, data communications, very fast interface control, and other applications of a similar nature.

The SL8X305 can fetch, decode, and execute a 16-bit instruction  word in a minimum of 200ns. Within one instruction cycle, the 8-bit data-processing path can be programmed to rotate, mask, shift, and/or merge single or multiple bit subfields and, in addition, perform an ALU operation; in the same instruction, an  external data field can be input, processed, and output to a specified destination - likewise, single or multiple bit data fields can be internally moved from a given source to a given destination. To summarize, fixed or variable-length data fields can be fetched, processed, operated on by the ALU, and moved to a different location - all in a timeframe of 200ns. To interface with I/O and program memory, the SL8X305 uses a 13-bit instruction bus, an 8-bit bidirectional multiplexed I/O data/address bus and a 5-bit I/O control bus.

A wide selection of I/O devices, interface chips, and specialpurpose parts are available for systems use. In most applications, the more powerful 8X305 is functionally interchangeable with its predecessor - the SL8X305 .