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DS80C320-MCG Datasheet(PDF) 5 Page - Dallas Semiconductor |
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DS80C320-MCG Datasheet(HTML) 5 Page - Dallas Semiconductor |
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5 / 42 page  DS80C320/DS80C323 5 of 42 DIP PLCC TQFP SIGNAL NAME DESCRIPTION 21 22 23 24 25 26 27 28 24 25 26 27 28 29 30 31 18 19 20 21 22 23 24 25 A8 (P2.0) A9 (P2.1) A10 (P2.2) A11 (P2.3) A12 (P2.4) A13 (P2.5) A14 (P2.6) A15 (P2.7) A15-A8 (Port 2) - Output. Port 2 serves as the MSB for external addressing. P2.7 is A15 and P2.0 is A8. The device will automatically place the MSB of an address on P2 for external ROM and RAM access. Although Port 2 can be accessed like an ordinary I/O port, the value stored on the Port 2 latch will never be seen on the pins (due to memory access). Therefore writing to Port 2 in software is only useful for the instructions MOVX A, @Ri or MOVX @Ri, A. These instructions use the Port 2 internal latch to supply the external address MSB. In this case, the Port 2 latch value will be supplied as the address information. 10-17 11, 13-19 5, 7-13 P3.0-P3.7 Port 3 - I/O. Port 3 functions as both an 8-bit bi-directional I/O port and an alternate functional interface for External Interrupts, Serial Port 0, Timer 0 & 1 Inputs, RD and WR strobes. The reset condition of Port 3 is with all bits at a 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 both the output high and input state. The alternate modes of Port 3 are outlined below: Port Alternate Mode 10 11 5 P3.0 RXD0 Serial Port 0 Input 11 13 7 P3.1 TXD0 Serial Port 0 Output 12 14 8 P3.2 INT0 External Interrupt 0 13 15 9 P3.3 INT1 External Interrupt 1 14 16 10 P3.4 T0 Timer 0 External Input 15 17 11 P3.5 T1 Timer 1 External Input 16 18 12 P3.6 WR External Data Memory Write Strobe 17 19 13 P3.7 RD External Data Memory Read Strobe 31 35 29 EA EA - Input. This pin must be connected to ground for proper operation. - 12 34 6 28 NC NC - Reserved. These pins should not be connected. They are reserved for use with future devices in this family. - 1 39 NC - Reserved. These pins are reserved for additional ground pins on future products. 80C32 COMPATIBILITY The DS80C320/DS80C323 is a CMOS 80C32-compatible microcontroller designed for high performance. In most cases it will drop into an existing 80C32 design to significantly improve the operation. Every effort has been made to keep the device familiar to 8032 users, yet it has many new features. In general, software written for existing 80C32-based systems will work on the DS80C320/DS80C323. The exception is critical timing since the High-Speed Microcontroller performs its instructions much faster than the original. It may be necessary to use memories with faster access times if the same crystal frequency is used. Application note 57 “DS80C320 Memory Interface Timing” is a useful tool to help the embedded system designer select the proper memories for her or his application. The DS80C320/DS80C323 runs the standard 8051 instruction set and is pin-compatible with an 80C32 in any of three standard packages. It also provides the same timer/counter resources, full-duplex serial port, 256 bytes of scratchpad RAM and I/O ports as the standard 80C32. Timers will default to a 12 clock per |
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Similar Description - DS80C320-MCG |
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