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IMQ82C55AZ Datasheet(PDF) 10 Page - Intersil Corporation |
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IMQ82C55AZ Datasheet(HTML) 10 Page - Intersil Corporation |
10 / 26 page 10 FN6140.2 June 15, 2006 ACK - (Acknowledge Input). A “low” on this input informs the 82C55A that the data from Port A or Port B is ready to be accepted. In essence, a response from the peripheral device indicating that it is ready to accept data, (See Note 1). INTR - (Interrupt Request). A “high” on this output can be used to interrupt the CPU when an output device has accepted data transmitted by the CPU. INTR is set when ACK is a “one”, OBF is a “one” and INTE is a “one”. It is reset by the falling edge of WR. INTE A Controlled by Bit Set/Reset of PC6. INTE B Controlled by Bit Set/Reset of PC2. NOTE: 1. To strobe data into the peripheral device, the user must operate the strobe line in a hand shaking mode. The user needs to send OBF to the peripheral device, generates an ACK from the peripheral device and then latch data into the peripheral device on the rising edge of OBF. FIGURE 6. MODE 1 INPUT FIGURE 7. MODE 1 (STROBED INPUT) 1 D7 0 D6 1 D5 1 D4 1/0 D3 D2 D1 D0 CONTROL WORD MODE 1 (PORT A) PC4 8 IBFA PC5 INTE A PA7-PA0 STBA INTRA PC3 PC6, PC7 I/O 2 RD PC6, PC7 1 = INPUT 0 = OUTPUT 1 D7 D6 D5 D4 D3 D2 D1 D0 CONTROL WORD MODE 1 (PORT B) PC2 8 IBFB PC1 INTE B PB7-PB0 STBB INTRB PC0 RD 11 tST STB INTR RD INPUT FROM IBF PERIPHERAL tSIB tSIT tPH tPS tRIT tRIB FIGURE 8. MODE 1 OUTPUT 1 D7 0 D6 1 D5 1 D4 1/0 D3 D2 D1 D0 CONTROL WORD MODE 1 (PORT A) PC7 8 ACKA PC6 PA7-PA0 OBFA INTRA PC3 PC4, PC5 2 WR PC4, PC5 1 = INPUT 0 = OUTPUT 1 D7 D6 D5 D4 D3 D2 D1 D0 CONTROL WORD MODE 1 (PORT B) PC1 8 ACKB PC2 INTE B PB7-PB0 OBFB INTRB PC0 WR 10 INTE A MS82C55A, MQ82C55A, MP82C55A |
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