Datenblatt-Suchmaschine für elektronische Bauteile |
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ST16C554 Datenblatt(PDF) 3 Page - Exar Corporation |
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ST16C554 Datenblatt(HTML) 3 Page - Exar Corporation |
3 / 39 page ST16C554/554D 3 REV. 4.0.1 2.97V TO 5.5V QUAD UART WITH 16-BYTE FIFO PIN DESCRIPTIONS Pin Description NAME 64-LQFP PIN # 68-PLCC PIN# TYPE DESCRIPTION DATA BUS INTERFACE A2 A1 A0 22 23 24 32 33 34 I Address data lines [2:0]. These 3 address lines select one of the internal regis- ters in UART channel A-D during a data bus transaction. D7 D6 D5 D4 D3 D2 D1 D0 60 59 58 57 56 55 54 53 5 4 3 2 1 68 67 66 I/O Data bus lines [7:0] (bidirectional). IOR# (VCC) 40 52 I When 16/68# pin is HIGH, the Intel bus interface is selected and this input becomes read strobe (active low). The falling edge instigates an internal read cycle and retrieves the data byte from an internal register pointed by the address lines [A2:A0], puts the data byte on the data bus to allow the host processor to read it on the rising edge. When 16/68# pin is LOW, the Motorola bus interface is selected and this input is not used and should be connected to VCC. IOW# (R/W#) 9 18 I When 16/68# pin is HIGH, it selects Intel bus interface and this input becomes write strobe (active low). The falling edge instigates the internal write cycle and the rising edge transfers the data byte on the data bus to an internal register pointed by the address lines. When 16/68# pin is LOW, the Motorola bus interface is selected and this input becomes read (HIGH) and write (LOW) signal. CSA# (CS#) 7 16 I When 16/68# pin is HIGH, this input is chip select A (active low) to enable chan- nel A in the device. When 16/68# pin is LOW, this input becomes the chip select (active low) for the Motorola bus interface. CSB# (A3) 11 20 I When 16/68# pin is HIGH, this input is chip select B (active low) to enable chan- nel B in the device. When 16/68# pin is LOW, this input becomes address line A3 which is used for channel selection in the Motorola bus interface. CSC# (A4) 38 50 I When 16/68# pin is HIGH, this input is chip select C (active low) to enable chan- nel C in the device. When 16/68# pin is LOW, this input becomes address line A4 which is used for channel selection in the Motorola bus interface. CSD# (VCC) 42 54 I When 16/68# pin is HIGH, this input is chip select D (active low) to enable chan- nel D in the device. When 16/68# pin is LOW, this input is not used and should be connected VCC. |
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