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DS2252T Datasheet(PDF) 4 Page - Dallas Semiconductor |
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DS2252T Datasheet(HTML) 4 Page - Dallas Semiconductor |
4 / 14 page DS2252T 121395 4/14 PIN ASSIGNMENT 1 P1.0 11 P1.5 21 P3.1 TXD 31 P3.6 WR 2VCC 12 P0.4 22 ALE 32 P2.4 3 P1.1 13 P1.6 23 P3.2 INT0 33 P3.7 RD 4 P0.0 14 P0.5 24 PROG 34 P2.3 5 P1.2 15 P1.7 25 P3.3 INT1 35 XTAL2 6 P0.1 16 P0.6 26 P2.7 36 P2.2 7 P1.3 17 RST 27 P3.4 T0 37 XTAL1 8 P0.2 18 P0.7 28 P2.6 38 P2.1 9 P1.4 19 P3.0 RXD 29 P3.5 T1 39 GND 10 P0.3 20 SDI 30 P2.5 40 P2.0 PIN DESCRIPTION PIN DESCRIPTION 4, 6, 8, 10, 12, 14, 16, 18 P0.0 – P0.7. General purpose I/O Port 0. This port is open–drain and can not drive a logic 1. It requires external pull–ups. Port 0 is also the multiplexed Expanded Address/Data bus. When used in this mode, it does not require pull–ups. 1, 3, 5, 7, 9, 11, 13, 15 P1.0 – P1.7. General purpose I/O Port 1. 40, 38, 36, 34, 32, 30, 28, 26 P2.0 – P2.7. General purpose I/O Port 2. Also serves as the MSB of the Expanded Address bus. 19 P3.0 RXD. General purpose I/O port pin 3.0. Also serves as the receive signal for the on board UART. This pin should NOT be connected directly to a PC COM port. 21 P3.1 TXD. General purpose I/O port pin 3.1. Also serves as the transmit signal for the on board UART. This pin should NOT be connected directly to a PC COM port. 23 P3.2 INT0. General purpose I/O port pin 3.2. Also serves as the active low External Interrupt 0. This pin is also connected to the INTP output of the DS1283 Real Time Clock. 25 P3.3 INT1. General purpose I/O port pin 3.3. Also serves as the active low External Interrupt 1. 27 P3.4 T0. General purpose I/O port pin 3.4. Also serves as the Timer 0 input. 29 P3.5 T1. General purpose I/O port pin 3.5. Also serves as the Timer 1 input. 31 P3.6 WR. General purpose I/O port pin. Also serves as the write strobe for Expanded bus operation. 33 P3.7 RD. General purpose I/O port pin. Also serves as the read strobe for Expanded bus operation. 17 RST – Active high reset input. A logic 1 applied to this pin will activate a reset state. This pin is pulled down internally, can be left unconnected if not used. An RC power–on reset circuit is not needed and is NOT recommended. 22 ALE – Address Latch Enable. Used to de–multiplex the multiplexed Expanded Address/Data bus on Port 0. This pin is normally connected to the clock input on a ’373 type transparent latch. |
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