CZ80PIO
Peripheral Device
Megafunction
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
8
8
data_i
data_o
data_tri
Features
ardy
astb_n
porta_i
porta_o
porta_tr
8
8
8
鈥?/div>
鈥?/div>
鈥?/div>
Provides a direct interface between Z80
microprocessor systems and peripheral
devices
Two ports with interrupt-driven handshake for
fast response
Four programmable operating modes:
鈥?/div>
Output Mode (both ports)
鈥?/div>
Input Mode (both ports)
鈥?/div>
Bi-directional (Port A only)
鈥?/div>
Bit Control Mode (both ports)
Programmable interrupts on peripheral status
conditions
clk
cdselect
portselect
ce_n
CZ80PIO
m1_n
iorq_n
rd_n
int_n
ieo
iei
brdy
bstb_n
portb_i
portb_
o
8
8
8
鈥?/div>
Applications
鈥?/div>
鈥?/div>
Programmable, dual - port device
Interface for a wide range of peripheral
devices such as:
鈥?/div>
Keyboards
鈥?/div>
鈥?/div>
鈥?/div>
Printers
Paper table readers
PROM programmers etc.
CAST, Inc.
May 2004
Page 1
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RF AMPLIFIER
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8-Bit Microprocessor Megafunction
ETC [ETC]
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Hereinafter Referred to As PIO, is a Dual-Port Device
ETC
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英文版
Hereinafter Referred to As PIO, is a Dual-Port Device
ETC [ETC]
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