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參數(shù)資料
| 型號(hào)： | IA8255-PLC44I |
| 廠商： | Innovasic Semiconductor |
| 英文描述： | Programmable Peripheral Interface Adapter |
| 中文描述： | 可編程外圍接口適配器 |
| 文件頁數(shù)： | 2/4頁 |
| 文件大?。?/td> | 49K |
| 代理商： | IA8255-PLC44I |
Page 2 of 4
I
A8255
Programmable Peripheral Interface Adapter
Advanced Information
Sheet
The IA8255 is a programmable peripheral interface adapter mega-function designed to be
functionally equivalent to the Intel 8255A and Harris 82C55A devices. This function has 24 I/O
signals programmable in two groups of 12. Three modes of operation allow the following:
Copyright
1999, InnovASIC Inc.
Customer SpecficIC Soutions
Basic Input/Output (Mode 0) - Port A, Port B, Port C (upper), and Port C (lower) can be
independently configured as inputs or outputs to read or hold static data. Outputs are
latched, but inputs are not latched.
Strobed Input/Output (Mode 1) - Port A and Port B can be independently configured as
strobed input or output buses. Signals from Port C are dedicated as control signals for data
handshaking.
Bidirectional Bus (Mode 2) - Port A can also be configured as a bidirectional bus, with the
majority of Port C providing the control signals. In this case, Port B is still capable of
implementing one of the previous described modes.
A
block diagram is shown in Figure 1.
Functional Block Diagram
Figure 1
DATA BUS
BUFFER
GROUP A
CONTROL
GROUP B
CONTROL
8 BIT INTERNAL
DATA BUS
GROUP A
PORT A
(8)
GROUP A
PORT C
UPPER (4)
GROUP B
PORT C
LOWER
(4)
GROUP B
PORT B
(8)
CONTROL
REGISTER AND
LOGIC
A0
A1
CS_n
RESET
RD_n
WR_n
D7:D0
I/O
PA7:PA0
I/O
PC7:PC4
I/O
PC3:PC0
I/O
PB7:PB0
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