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MD82C55B 参数 Datasheet PDF下载

MD82C55B图片预览
型号: MD82C55B
PDF下载: 下载PDF文件 查看货源
内容描述: CMOS可编程外设接口 [CMOS Programmable Peripheral Interface]
分类和应用:
文件页数/大小: 26 页 / 236 K
品牌: HARRIS [ HARRIS CORPORATION ]
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82C55A  
MODE DEFINITION SUMMARY  
MODE 1  
MODE 0  
MODE 2  
IN  
OUT  
IN  
OUT  
GROUP A ONLY  
PA0  
PA1  
PA2  
PA3  
PA4  
PA5  
PA6  
PA7  
In  
In  
In  
In  
In  
In  
In  
In  
Out  
Out  
Out  
Out  
Out  
Out  
Out  
Out  
In  
In  
In  
In  
In  
In  
In  
In  
Out  
Out  
Out  
Out  
Out  
Out  
Out  
Out  
PB0  
PB1  
PB2  
PB3  
PB4  
PB5  
PB6  
PB7  
In  
In  
In  
In  
In  
In  
In  
In  
Out  
Out  
Out  
Out  
Out  
Out  
Out  
Out  
In  
In  
In  
In  
In  
In  
In  
In  
Out  
Out  
Out  
Out  
Out  
Out  
Out  
Out  
Mode 0  
or Mode 1  
Only  
PC0  
PC1  
PC2  
PC3  
PC4  
PC5  
PC6  
PC7  
In  
In  
In  
In  
In  
In  
In  
In  
Out  
Out  
Out  
Out  
Out  
Out  
Out  
Out  
INTRB  
IBFB  
STBB  
INTRA  
STBA  
IBFA  
I/O  
INTRB  
OBFB  
ACKB  
INTRA  
I/O  
I/O  
ACKA  
OBFA  
I/O  
I/O  
I/O  
INTRA  
STBA  
IBFA  
ACKA  
OBFA  
I/O  
Special Mode Combination Considerations  
INPUT CONFIGURATION  
D5 D4 D3 D2  
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.  
D7  
D6  
D1  
D0  
I/O  
I/O  
IBFA INTEA INTRA INTEB IBFB INTRB  
GROUP A  
OUTPUT CONFIGURATION  
GROUP B  
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.  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
OBFA INTEA  
I/O  
I/O  
INTRA INTEB OBFB INTRB  
GROUP B  
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.  
GROUP A  
FIGURE 15. MODE 1 STATUS WORD FORMAT  
D7  
D6  
D5  
D4  
D3  
D2  
D1  
D0  
OBFA INTE1 IBFA INTE2 INTRA  
X
X
X
GROUP A  
GROUP B  
With a “Set/Reset Port Cea 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 fare not affected by a  
“Set/Reset Port C Bit” command. Writing to the correspond-  
ing 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.  
(Defined by Mode 0 or Mode 1 Selection)  
FIGURE 16. MODE 2 STATUS WORD FORMAT  
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.  
13  
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