C8254
Programmable
Timer/Counter Megafunction
Introduction
The C8254 programmable interval timer/counter megafunction is a high-performance device, which is
designed to solve the common timing control problems in microcomputer system design. It provides three
independent 16-bit counters, and each counter may operate in a different mode. All modes are software
programmable. Six programmable timer modes allow the device to be used as an event counter, elapsed time
indicator, programmable one-shot, and in many other applications.
Symbol
Features
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Three Independent 16-bit Counters
Status Read-Back Command
Counter Latch Command
Read/Write LSB only or MSB only or LSB
first then MSB
Six Programmable Counter Modes
o
o
o
o
o
o
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Interrupt on Terminal Count
Hardware Retriggerable One-Shot
Rate Generator
Square Wave Mode
Software Triggered Strobe
Hardware Triggered Strobe
(Retriggerable)
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ADDR[1:0]
DIN[7:0]
CSN
RDN
DOUT[7:0]
WRN
OUT0
CLK0
OUT1
GATE0
OUT2
CLK1
GATE1
CLK2
GATE2
RESETN
C8254
Binary or BCD Counting
Also available in VHDL or Verilog
Functionality based on the INTEL 8254
Applications
The six programmable timer modes allow the
C8254 to be used in applications requiring event
counters, elapsed time indicators, and
programmable one-shots among others.
CAST, Inc.
March 2004
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