參數(shù)資料
型號(hào)： HS1-82C55ARH-8
廠商： HARRIS SEMICONDUCTOR
元件分類： 微控制器/微處理器
英文描述： Radiation Hardened CMOS Programmable Peripheral Interface
中文描述： 24 I/O, PIA-GENERAL PURPOSE, CDIP40
文件頁(yè)數(shù)： 13/23頁(yè)
文件大小： 165K
代理商： HS1-82C55ARH-8
982
HS-82C55ARH
Control Word will always be in the format illustrated in Figure
11 with Bit D7 high to indicate Control Word Mode Informa-
tion.
FIGURE 10. BASIC MODE DEFINITIONS & BUS INTERFACE
TABLE 1.
A1
A0
RD
WR
CS
INPUT OPERATION
(READ)
0
0
0
1
0
Port A - Data Bus
0
1
0
1
0
Port B - Data Bus
1
0
0
1
0
Port C - Data Bus
1
1
0
1
0
Control Word - Data Bus
TABLE 2.
A1
A0
RD
WR
CS
OUTPUT OPERATION
(WRITE)
0
0
1
0
0
Data Bus - Port A
0
1
1
0
0
Data Bus - Port B
1
0
1
0
0
Data Bus - Port C
1
1
1
0
0
Data Bus - Control Word
RD, WR
D7 - D0
A0 - A1
CS
B
C
A
8
4
8
4
I/O
I/O
I/O
I/O
PB7 - PB0 PC3 - PC0 PC7 - PC4 PA7 - PA0
MODE 0
DATA BUS
CONTROL BUS
ADDRESS BUS
B
C
A
8
8
I/O
I/O
PB7 - PB0
PA7 - PA0
MODE 1
CONTROL
OR I/O
CONTROL
OR I/O
B
C
A
8
8
I/O
BIDIREC-
TIONAL
PB7 - PB0
PA7 - PA0
MODE 2
I/O
CONTROL
FIGURE 11. MODE SET CONTROL WORD FORMAT
Mode Selection
There are three basic modes of operation that can be
selected by the system software:
Mode 0 - Basic Input/Output
Mode 1 - Strobed Input/Output
Mode 2 - Bidirectional Bus
When the RESET input goes “high”, all ports will be set to
the input mode with all 24 port lines held at the logic “one”
level by internal bus hold devices. After reset, the HS-
82C55ARH can remain in the input mode with no additional
initialization required. This eliminates the need for pullup or
pulldown resistors in all CMOS designs. During the
execution of the system program, any of the other modes
may be selected using a single output instruction. This
allows a single HS-82C55ARH to service a variety of
peripheral devices with a simple software maintenance
routine.
The modes for Port A and Port B can be separately defined
while Port C is divided into two portions as required by the
Port A and Port B definitions. All of the output registers,
including the status register, will be reset whenever the
mode is changed. Modes may be combined so that their
functional definition can be “tailored” to almost any I/O struc-
ture. For instance: Group B can be programmed in Mode 0
to monitor simple switch closings or display computational
results, Group A could be programmed in Mode 1 to monitor
a keyboard or tape recorder on an interrupt-driven basis.
TABLE 3.
A1
A0
RD
WR
CS
DISABLE FUNCTION
X
X
X
X
1
Data Bus - 3-State
X
X
1
1
0
Data Bus - 3-State
D7 D6 D5 D4 D3 D2 D1 D0
CONTROL WORD
GROUP B
PORT C (LOWER)
1 = INPUT
0 = OUTPUT
PORT B
1 = INPUT
0 = OUTPUT
MODE SELECTION
0 = MODE 0
1 = MODE 1
GROUP A
PORT C (UPPER)
1 = INPUT
0 = OUTPUT
PORT A
1 = INPUT
0 = OUTPUT
MODE SELECTION
00 = MODE 0
01 = MODE 1
1X = MODE 2
MODE SET FLAG
1 = ACTIVE
Spec Number
518060
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