SL8X305
Microcontroller
Legacy Device:
Philips/Signetics S8X305
FEATURES
• 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
• On–chip oscillator and timing generation
• Single +5V supply
• Multiple package options
PRODUCT DESCRIPTION
The Signetics 8X305 Microcontroller (Figure 1) is a
high–speed bipolar microprocessor implemented with
low–power Schottky technology. In a single chip, the 8X305
combines speed, flexibility, and a bit–oriented instruction set.
These features and other basic characteristics of the chip com-
bine to provide cost–effective solutions for a broad range of
applications. The 8X305 is particularly useful in systems that
require high–speed bit manipulations — sophisticated con-
trollers, data communications, very fast interface control, and
other applications of a similar nature.
The 8X305 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 addi-
tion, perform an ALU operation; in the same instruction, an
external data field can be input, processed, and output to a speci-
fied 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 dif-
ferent location — all in a timeframe of 200ns. To interface with
I/O and program memory, the 8X305 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 special-
purpose parts are available for systems use. In most applications,
the more powerful 8X305 is functionally interchangeable with its
predecessor — the 8X300.
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