C8051 Datasheet, PDF (1/3 Pages) List of Unclassifed Manufacturers – Legacy-Speed 8-Bit Processor Core

C8051
Legacy-Speed 8-Bit
Processor Core
The C8051 core implements a single-chip, 8-bit microcontroller that executes all ASM51
instructions and has the same instruction set and timing of the 80C31. On-chip debug-
ging is an option.
The microcode-free design was developed for reuse in ASICs and FPGAs. It is strictly
synchronous, with positive-edge clocking (except for a flip-flop for internal reset and two
flip-flops for gated clocks in the PMU), no internal tri-states and a synchronous reset.
Scan insertion is therefore straightforward.
Applications
The C8051 can be utilized for a variety of applications including:
• Embedded microcontroller systems
• Data computation and transfer
• Communication systems
• Professional audio and video
Symbol
reset _C8051 p0i
clk
p1i
ea
p2i
p3i
ale
psen
p0o
p1o
clkcpu
p2o
clkper
p3o
clkcpuo
clkpero
ramdatai
ramdatao
sfrdatai
ramaddr
sfrdatao
sfraddr
ramwe
ramoe
sfroe
sfrwe
romdatai
romaddr
romoe
8-bit Control Unit
8-bit Arithmetic-Logic Unit with
8-bit multiplication and division
Instruction decoder
Four 8-bit Input / Output ports
Two 16-bit Timer/Counters
Serial Peripheral Interface in full
duplex mode
Synchronous mode, fixed baud
rate
8-bit & 9-bit UART mode, vari-
able baud rate
9-bit UART mode, fixed baud
rate
Multiprocessor communication
Two Level Priority Interrupt Sys-
tem
5 Interrupt Sources
Internal Clock prescaler and
Phase Generator
256 bytes of Read/Write Data
Memory Space
64KB External Program Memory
Space
64KB External Data Memory
Space
Services up to 107 External
Special Function Registers
Power Management Unit sup-
ports stop and idle modes
On-Chip-Instrumentation De-
bugging (optional)
Optional Features
Fast Multiplication-Division Unit
o _{16 x 16 bit multiplication}
o _{32 / 16 bit division}
o _{16 / 16 bit division}
o _{32 bit normalization}
o _{32 bit L/R shifting}
Compare/Capture Unit
o _{Four 16-bit Compare registers}
used for Pulse With Modula-
tion
o _{Four external Capture inputs}
used for Pulse With Measuring
o _{16-bit Reload register used}
for Pulse Generation
Programmable Watchdog Timer
Third 16-bit Timer/Counter
Second Serial Peripheral Inter-
faces
Real Time Clock
On-Chip-Instrumentation De-
bugging
May 2004