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DS5000 Datasheet(PDF) 3 Page - Dallas Semiconductor |
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DS5000 Datasheet(HTML) 3 Page - Dallas Semiconductor |
3 / 19 page DS5000(T) 3 of 19 PIN DESCRIPTION PIN NAME FUNCTION 1–8 P1.0–P1.7 General-Purpose I/O Port 1 9 RST Active-High Reset Input. A logic 1 applied to this pin will activate a reset state. This pin is pulled down internally so this pin can be left unconnected if not used. 10 P3.0/RXD General-Purpose I/O Port Pin 3.0/Receive Signal for On-Board UART. This pin should not be connected directly to a PC COM port. 11 P3.1/TXD General-Purpose I/O Port Pin 3.1/Transmit Signal for On-Board UART. This pin should not be connected directly to a PC COM port. 12 P3.2/ INT0 General-Purpose I/O Port Pin 3.2/Active-Low External Interrupt 0 13 P3.3/ INT1 General-Purpose I/O Port Pin 3.3/Active-Low External Interrupt 1 14 P3.4/T0 General-Purpose I/O Port Pin 3.4/Timer 0 Input 15 P3.5/T1 General-Purpose I/O Port Pin 3.5/Timer 1 Input 16 P3.6/ WR General-Purpose I/O Port Pin 3.6/Active-Low Write Strobe for Expanded Bus Operation 17 P3.7/ RD General-Purpose I/O Port Pin 3.7/Active-Low Read Strobe for Expanded Bus Operation 18, 19 XTAL2, XTAL1 Crystal Connection. Used to connect an external crystal to the internal oscillator. XTAL1 is the input to an inverting amplifier and XTAL2 is the output. 20 GND Logic Ground 21–28 P2.0–P2.7/ A8–A15 General-Purpose I/O Port 2/MSB of the Expanded Address Bus 29 PSEN Active-Low Program Store Enable. Used to enable an external program memory when using the expanded bus. It is normally an output and should be unconnected if not used. PSEN also is used to invoke the bootstrap loader. At this time, PSEN is pulled down externally. This should only be done once the DS5000(T) is already in a reset state. The device that pulls down should be open drain since it must not interfere with PSEN under normal operation. 30 ALE Address Latch Enable. Used to demultiplex the multiplexed expanded address/data bus on Port 0. This pin is normally connected to the clock input on a ’373 type transparent latch. When using a parallel programmer, this pin also assumes the PROG function for programming pulses. 31 EA Active-Low External Access. This pin forces the DS5000(T) to behave like an 8031. No internal memory (or clock) is available when this pin is at a logic low. Since this pin is pulled down internally, it should be connected to +5V to use NV RAM. In a parallel programmer, this pin also serves as VPP for super voltage pulses. 32-39 P0.7–P0.0/ AD7–AD0 General-Purpose I/O Port 0/Multiplexed Expanded Address/Data Bus. This port is open drain and cannot drive a logic 1. It requires external pullups. When used in the multiplexed expanded address data/bus mode, this pin does not require pullups. 40 VCC +5V Power Supply |
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