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82C55 датащи(PDF) 21 Page - Intersil Corporation

номер детали 82C55
подробное описание детали  Radiation Hardened CMOS Programmable Peripheral Interface
PDF  23 Pages
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производитель  INTERSIL [Intersil Corporation]
домашняя страница  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

82C55 датащи(HTML) 21 Page - Intersil Corporation

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HS-82C55ARH
Current Drive Capability
Any output on Port A, B or C can sink or source 2.5mA. This
feature allows the 82C55A to directly drive Darlington type
drivers and high-voltage displays that require such sink or
source current.
Reading Port C Status (Figures 23 and 24)
In Mode 0, Port C transfers data to or from the peripheral
device. When the 82C55A is programmed to function in
Modes 1 or 2, Port C generates or accepts “hand shaking”
signals with the peripheral device. Reading the contents of
Port C allows the programmer to test or verify the “status” of
each peripheral device and change the program flow
accordingly.
There is no special instruction to read the status information
from Port C. A normal read operation of Port C is executed
to perform this function.
FIGURE 25. INTERRUPT ENABLE FLAGS IN MODES 1 AND 2
INTERRUPT
ENABLE FLAG*
POSITION
ALTERNATE PORT C
PIN SIGNAL (MODE)
INTE B
PC2
ACKB (Output Mode 1) or
STBB (Input Mode 1)
INTE A2
PC4
STBA (Input Mode 1 or
Mode 2)
INTE A1
PC6
ACKA (Output Mode 1 or
Mode 2)
Spec Number
518060



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