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參數(shù)資料
| 型號： | IP82C55A |
| 廠商： | Intersil |
| 文件頁數(shù)： | 6/29頁 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER 24B 40DIP |
| 標準包裝： | 99 |
| 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： | 通孔 |
| 封裝/外殼： | 40-DIP（0.600"，15.24mm） |
| 供應(yīng)商設(shè)備封裝： | 40-DIP |
| 包裝： | 管件 |
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14
FN2969.10
November 16, 2006
Special Mode Combination Considerations
There are several combinations of modes possible. For any
combination, some or all of Port C lines are used for control
or status. The remaining bits are either inputs or outputs as
defined by a “Set Mode” command.
During a read of Port C, the state of all the Port C lines,
except the ACK and STB lines, will be placed on the data
bus. In place of the ACK and STB line states, flag status will
appear on the data bus in the PC2, PC4, and PC6 bit
positions as illustrated by Figure 17.
Through a “Write Port C” command, only the Port C pins
programmed as outputs in a Mode 0 group can be written.
No other pins can be affected by a “Write Port C” command,
nor can the interrupt enable flags be accessed. To write to
any Port C output programmed as an output in Mode 1
group or to change an interrupt enable flag, the “Set/Reset
Port C Bit” command must be used.
With a “Set/Reset Port C Bit” command, any Port C line
programmed as an output (including IBF and OBF) can be
written, or an interrupt enable flag can be either set or reset.
Port C lines programmed as inputs, including ACK and STB
lines, associated with Port C are not affected by a “Set/Reset
Port C Bit” command. Writing to the corresponding Port C bit
positions of the ACK and STB lines with the “Set Reset Port
C Bit” command will affect the Group A and Group B
interrupt enable flags, as illustrated in Figure 17.
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 15 and 16)
In Mode 0, Port C transfers data to or from the peripheral
device. When the 82C55A is programmed to function in
MODE DEFINITION SUMMARY
MODE 0
MODE 1
MODE 2
IN
OUT
IN
OUT
GROUP A ONLY
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
In
Out
In
Out
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
In
Out
In
Out
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
In
Out
INTRB
IBFB
STBB
INTRA
STBA
IBFA
I/O
INTRB
OBFB
ACKB
INTRA
I/O
ACKA
OBFA
I/O
INTRA
STBA
IBFA
ACKA
OBFA
Mode 0
or Mode 1
Only
INPUT CONFIGURATION
D7
D6
D5
D4
D3
D2
D1
D0
I/O
IBFA
INTEA INTRA INTEB
IBFB
INTRB
OUTPUT CONFIGURATION
D7
D6
D5
D4
D3
D2
D1
D0
OBFA INTEA
I/O
INTRA INTEB
OBFB INTRB
FIGURE 15. MODE 1 STATUS WORD FORMAT
D7
D6
D5
D4
D3
D2
D1
D0
OBFA
INTE1
IBFA
INTE2 INTRA
X
(Defined by Mode 0 or Mode 1 Selection)
FIGURE 16. MODE 2 STATUS WORD FORMAT
GROUP A
GROUP B
GROUP A
GROUP B
GROUP A
GROUP B
82C55A
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