Text preview for : 6821 pia.pdf part of SOLARTRON 6821 pia . Rare and Ancient Equipment SOLARTRON 7081 Mickle diagrams 6821 pia.pdf
Back to : 6821 pia.pdf | Home
PERIPHERAL INTERFACE ADAPTER (PIA)
The MC6821 Peripheral Interface Adapter provides the universal
IN-CHAN
means of interfacing peripheral equipment to the M6800 family of
microprocessors. This device is capable of interfacing the MPU to
peripherals through two 8-bit bidirectional peripheral data buses and
four control lines. No external logic is required for interfacing to most
peripheral devices.
The functional configuration of the PIA is programmed by the MPU
during system initialization. Each of the peripheral data lines can be pro-
grammed to act as an input or output, and each of the four con-
trol/interrupt lines may be programmed for one of several control
modes. This allows a high degree of flexibility in the overall operation of
the interface.
@ 8-Bit Bidirectional Data Bus for Communication with the
MPU
@ Two Bidirectional 8-Bit Buses for Interface to Peripherals
@ Two Programmable Control Registers
@ Two Programmable Data Direction Registers
@ Four Individually-Controlled Interrupt Input Lines; Two ERDIP PACKAGE
*&a `3,*V$3
*>~+s\~,
Usable as Peripheral Control Outputs \; "`i ,J
k" 3
@ Handshake Control Logic for Input and Output Periphe~~~~`~~~~.~`~"` .h*+
.,`:#
Operation Kit\&
`i.
High-Impedance Three-State and Direct Transis$r DriGe
Peripheral Lines >@.`+ PLASTIC PACKAGE
!a<$."&
_ CASE 711
Program Controlled Interrupt and InterruptV&$%$e Capability
CMOS Drive Capability on Side A Peri~~~~~~~~~~~s
Two TTL Drive Capability on All A a~~~~~~~e Buffers _'
0 TTL-Compatible /;;;g>* *v*
,A. ,*e .\+
x;<+"<& PIN ASSIGNMENT
@ Static Operation ,V,&,,i `\<
`~`":
,,;# vi, A
*&p
INFORMATION
Frequency
(MHz) Temperature Order Number
1.0 OT to 70