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CS82C55A-5 Datasheet(PDF) 11 Page - Intersil Corporation |
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CS82C55A-5 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 29 page 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 “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. 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 “low” 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 |
Número de pieza similar - CS82C55A-5 |
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Descripción similar - CS82C55A-5 |
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