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DS2252T Datasheet(PDF) 4 Page - Dallas Semiconductor |
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DS2252T Datasheet(HTML) 4 Page - Dallas Semiconductor |
4 / 15 page DS2252T 4 of 15 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 pullups. Port 0 is also the multiplexed Expanded Address/Data bus. When used in this mode, it does not require pullups. 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. |
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