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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  
tWOB  
WR  
tAOB  
OBF  
INTR  
tWIT  
ACK  
tAK  
tAIT  
OUTPUT  
tWB  
FIGURE 9. MODE 1 (STROBED OUTPUT)  
8
8
PA7-PA0  
PC4  
PA7-PA0  
PC7  
STBA  
IIBFA  
INTRA  
I/O  
OBFA  
ACKA  
INTRA  
I/O  
RD  
WR  
CONTROL WORD  
CONTROL WORD  
D7 D6 D5 D4 D3 D2 D1 D0  
PC5  
PC3  
PC6  
PC3  
D7 D6 D5 D4 D3 D2 D1 D0  
1
0
1
1
1/0  
1
0
1
0
1
0
1/0  
1
1
2
2
PC6, PC7  
PC4, PC5  
PC6, PC7  
PC4, PC5  
1 = INPUT  
0 = OUTPUT  
1 = INPUT  
0 = OUTPUT  
8
PB7, PB0  
PB7, PB0  
8
PC1  
PC2  
PC0  
PC2  
PC1  
PC0  
OBFB  
ACKB  
INTRB  
STBB  
IBFB  
WR  
RD  
INTRB  
PORT A - (STROBED INPUT)  
PORT B - (STROBED OUTPUT)  
PORT A - (STROBED OUTPUT)  
PORT B - (STROBED INPUT)  
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  
Operating Modes  
Mode 2 (Strobed Bi-Directional Bus I/O)  
Output Operations  
The functional configuration provides a means for communi-  
cating with a peripheral device or structure on a single 8-bit  
bus for both transmitting and receiving data (bi-directional  
bus I/O). “Hand shaking” signals are provided to maintain  
proper bus flow discipline similar to Mode 1. Interrupt gener-  
ation and enable/disable functions are also available.  
OBF - (Output Buffer Full). The OBF output will go “low” to  
indicate that the CPU has written data out to port A.  
ACK - (Acknowledge). A “low” on this input enables the  
three-state output buffer of port A to send out the data. Oth-  
erwise, the output buffer will be in the high impedance state.  
INTE 1 - (The INTE flip-flop associated with OBF). Con-  
trolled by bit set/reset of PC4.  
Mode 2 Basic Functional Definitions:  
• Used in Group A only  
• One 8-bit, bi-directional bus Port (Port A) and a 5-bit  
control Port (Port C)  
Input Operations  
STB - (Strobe Input). A “low” on this input loads data into the  
input latch.  
• Both inputs and outputs are latched  
• The 5-bit control port (Port C) is used for control and  
status for the 8-bit, bi-directional bus port (Port A)  
IBF - (Input Buffer Full F/F). A “high” on this output indicates  
that data has been loaded into the input latch.  
Bi-Directional Bus I/O Control Signal Definition  
INTE 2 - (The INTE flip-flop associated with IBF). Controlled  
(Figures 11, 12, 13, 14)  
by bit set/reset of PC4.  
INTR - (Interrupt Request). A high on this output can be  
used to interrupt the CPU for both input or output operations.  
10  
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