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參數(shù)資料
| 型號(hào)： | CZ80PIO |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Hereinafter Referred to As PIO, is a Dual-Port Device |
| 中文描述： | 以下簡(jiǎn)稱(chēng)為先鋒，是一個(gè)雙端口器件 |
| 文件頁(yè)數(shù)： | 1/4頁(yè) |
| 文件大?。?/td> | 165K |
| 代理商： | CZ80PIO |
CZ80PIO
Peripheral Device
Megafunction
CAST, Inc.
May 2004
Page 1
General Description
The CZ80PIO, hereinafter referred to as PIO, is a dual-port device which can be programmed by the system
software to function as a broad range of peripheral devices that are compatible with the Z80CPU such as most
keyboards, printers etc.
System design is simplified because the PIO connects directly to the Z80CPU with no additional logic. In larger
systems, address decoders and buffers may be required.
The CZ80PIO is a microcode-free design developed for reuse in ASIC and FPGA implementations. The design
is strictly synchronous, with no internal tri-states and a synchronous reset.
Symbol
brdy
bstb_n
portb_i
portb_
o
8
8
8
8
8
8
8
8
data_i
data_o
data_tri
int_n
ieo
iei
clk
cdselect
portselect
ce_n
m1_n
iorq_n
rd_n
CZ80PIO
ardy
astb_n
porta_i
porta_o
porta_tr
Features
Provides a direct interface between Z80
microprocessor systems and peripheral
devices
Two ports with interrupt-driven handshake for
fast response
Four programmable operating modes:
Output Mode (both ports)
Input Mode (both ports)
Bi-directional (Port A only)
Bit Control Mode (both ports)
Programmable interrupts on peripheral status
conditions
Applications
Programmable, dual - port device
Interface for a wide range of peripheral
devices such as:
Keyboards
Printers
Paper table readers
PROM programmers etc
.
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