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參數(shù)資料
| 型號： | IS82C55A |
| 廠商： | Intersil |
| 文件頁數(shù)： | 3/29頁 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER 24B 44PLCC |
| 標準包裝： | 260 |
| 接口： | 可編程 |
| 輸入/輸出數(shù)： | 24 |
| 中斷輸出： | 無 |
| 電源電壓： | 4.5 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 44-LCC（J 形引線） |
| 供應商設備封裝： | 44-PLCC |
| 包裝： | 管件 |
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11
FN2969.10
November 16, 2006
Operating Modes
Mode 2 (Strobed Bidirectional Bus I/O)
This functional configuration provides a means for
communicating with a peripheral device or structure on a
single 8-bit bus for both transmitting and receiving data
(bidirectional bus I/O). “Hand shaking” signals are provided to
maintain proper bus flow discipline similar to Mode 1. Interrupt
generation and enable/disable functions are also available.
Mode 2 Basic Functional Definitions:
Used in Group A only
One 8-bit, bidirectional bus Port (Port A) and a 5-bit
control Port (Port C)
Both inputs and outputs are latched
The 5-bit control port (Port C) is used for control and
status for the 8-bit, bidirectional bus port (Port A)
Bidirectional Bus I/O Control Signal Definition
(Figures 11, 12, 13, 14)
INTR - (Interrupt Request). A high on this output can be
used to interrupt the CPU for both input or output operations.
Output Operations
OBF - (Output Buffer Full). The OBF output will go “l(fā)ow” to
indicate that the CPU has written data out to port A.
ACK - (Acknowledge). A “l(fā)ow” on this input enables the three-
state output buffer of port A to send out the data. Otherwise,
the output buffer will be in the high impedance state.
INTE 1 - (The INTE flip-flop associated with OBF).
Controlled by bit set/reset of PC4.
Input Operations
STB - (Strobe Input). A “l(fā)ow” on this input loads data into the
input latch.
IBF - (Input Buffer Full F/F). A “high” on this output indicates
that data has been loaded into the input latch.
INTE 2 - (The INTE flip-flop associated with IBF). Controlled
by bit set/reset of PC4.
FIGURE 9. MODE 1 (STROBED OUTPUT)
tWOB
tWB
tAK
tAIT
tAOB
tWIT
OBF
WR
INTR
ACK
OUTPUT
Combinations of Mode 1: Port A and Port B can be individually defined as input or output in Mode 1 to support a wide variety of strobed I/O applications.
FIGURE 10. COMBINATIONS OF MODE 1
1
D7
0
D6
1
D5
1
D4
1/0
D3 D2 D1 D0
CONTROL WORD
PORT A - (STROBED INPUT)
PC4
8
OBFB
PA7-PA0
STBA
INTRB
PC0
PC6, PC7
2
WR
PC6, PC7
1 = INPUT
0 = OUTPUT
PORT B - (STROBED OUTPUT)
8
IIBFA
PC5
INTRA
PC3
ACKB
PC2
I/O
PC1
PB7, PB0
RD
10
1
D7
0
D6
1
D5
0
D4
1/0
D3 D2 D1 D0
CONTROL WORD
PORT A - (STROBED OUTPUT)
PC7
8
STBB
PA7-PA0
OBFA
INTRB
PC0
PC4, PC5
2
RD
PC4, PC5
1 = INPUT
0 = OUTPUT
PORT B - (STROBED INPUT)
8
ACKA
PC6
INTRA
PC3
IBFB
PC1
I/O
PC2
PB7, PB0
WR
11
82C55A
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