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DS80C320-ENL+ Datasheet(PDF) 4 Page - Maxim Integrated Products |
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DS80C320-ENL+ Datasheet(HTML) 4 Page - Maxim Integrated Products |
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4 / 40 page  DS80C320/DS80C323 High-Speed/Low-Power Microcontrollers 4 of 40 PIN DESCRIPTION (continued) PIN DIP PLCC TQFP NAME FUNCTION 30 33 27 ALE Address Latch-Enable Output. This pin functions as a clock to latch the external address LSB from the multiplexed address/data bus. This signal is commonly connected to the latch enable of an external 373 family transparent latch. ALE has a pulse width of 1.5 XTAL1 cycles and a period of four XTAL1 cycles. ALE is forced high when the device is in a reset condition. 39 43 37 AD0 38 42 36 AD1 37 41 35 AD2 36 40 34 AD3 35 39 33 AD4 34 38 32 AD5 33 37 31 AD6 32 36 30 AD7 Port 0, Input/Output. Port 0 is the multiplexed address/data bus. During the time when ALE is high, the LSB of a memory address is presented. When ALE falls, the port transitions to a bi-directional data bus. This bus is used to read external ROM and read/write external RAM memory or peripherals. The Port 0 has no true port latch and cannot be written directly by software. The reset condition of Port 0 is high. No pullup resistors are needed. Port 1, I/O. Port 1 functions as both an 8-bit, bidirectional I/O port and an alternate functional interface for Timer 2 I/O, new External Interrupts, and new Serial Port 1. The reset condition of Port 1 is with all bits at logic 1. In this state, a weak pullup holds the port high. This condition also serves as an input mode, since any external circuit that writes to the port will overcome the weak pullup. When software writes a 0 to any port pin, the device will activate a strong pulldown that remains on until either a 1 is written or a reset occurs. Writing a 1 after the port has been at 0 will cause a strong transition driver to turn on, followed by a weaker sustaining pullup. Once the momentary strong driver turns off, the port once again becomes the output high (and input) state. The alternate modes of Port 1 are outlined as follows: PIN DIP PLCC TQFP PORT ALTERNATE FUNCTION 1 2 40 P1.0 T2 External I/O for Timer/Counter 2 2 3 41 P1.1 T2EX Timer/Counter 2 Capture/Reload Trigger 3 4 42 P1.2 RXD1 Serial Port 1 Input 4 5 43 P1.3 TXD1 Serial Port 1 Output 5 6 44 P1.4 INT2 External Interrupt 2 (Positive-Edge Detect) 6 7 1 P1.5 INT3 External Interrupt 3 (Negative-Edge Detect) 7 8 2 P1.6 INT4 External Interrupt 4 (Positive-Edge Detect) 1–8 2–9 40–44, 1–3 P1.0–P1.7 8 9 3 P1.7 INT5 External Interrupt 5 (Negative-Edge Detect) |
Similar Part No. - DS80C320-ENL+ |
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