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C8051

Description
Legacy-Speed 8-Bit Processor Core
File Size200KB,3 Pages
ManufacturerETC
Download Datasheet View All

C8051 Overview

Legacy-Speed 8-Bit Processor Core

8-bit Control Unit
8-bit Arithmetic-Logic Unit with
8-bit multiplication and division
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.
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)
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
Optional Features
Fast Multiplication-Division Unit
reset
clk
ea
ale
psen
clkcpu
clkper
clkcpuo
clkpero
sfrdatai
sfrdatao
sfraddr
sfroe
sfrwe
C8051
p0i
p1i
p2i
p3i
p0o
p1o
p2o
p3o
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
ramdatai
ramdatao
ramaddr
ramwe
ramoe
romdatai
romaddr
romoe
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
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