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參數(shù)資料
| 型號： | C8254 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 通用總線功能 |
| 英文描述： | PROGRAMMABLE TIMER /COUNTER MEGAFUNCTION |
| 中文描述： | 可編程定時/計數(shù)器宏功能 |
| 文件頁數(shù)： | 1/6頁 |
| 文件大小： | 290K |
| 代理商： | C8254 |
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
C8254
DOUT[7:0]
OUT0
OUT1
OUT2
ADDR[1:0]
DIN[7:0]
CSN
RDN
WRN
CLK0
GATE0
CLK1
GATE1
CLK2
GATE2
RESETN
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.
Features
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
Interrupt on Terminal Count
o
o
o
o
o
o
Hardware Triggered Strobe
(Retriggerable)
Hardware Retriggerable One-Shot
Rate Generator
Square Wave Mode
Software Triggered Strobe
Binary or BCD Counting
Also available in VHDL or Verilog
Functionality based on the INTEL 8254
CAST, Inc.
March 2004
Page 1
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