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8XC51GB-1 Scheda tecnica(PDF) 4 Page - Intel Corporation |
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8XC51GB-1 Scheda tecnica(HTML) 4 Page - Intel Corporation |
4 / 22 page 8XC51GB ALTERNATE PORT FUNCTIONS Ports 0 1 2 3 4 and 5 have alternate functions as well as their IO function as described below Port Pin Alternate Function P00ADO – P07AD7 Multiplexed AddressData for External Memory P10T2 Timer 2 External Clock InputClock-Out P11T2EX Timer 2 ReloadCaptureDirection Control P12ECI PCA External Clock Input P13CEXO – P17CEX4 PCA Capture Input ComparePWM Output P20A8 – P27A15 High Byte of Address for External Memory P30RXD Serial Port Input P31TXD Serial Port Output P32INT0 External Interrupt 0 P33INT1 External Interrupt 1 P34T0 Timer 0 External Clock Input P35T1 Timer 1 External Clock Input P36WR Write Strobe for External Memory P37RD Read Strobe for External Memory P40SEPCLK Clock Source for Serial Expansion Port P41SEPDAT Data IO for the Serial Expansion Port P42ECI1 PCA1 External Clock Input P43C1EX0 – P47C1EX4 PCA1 Capture Input ComparePWM Output P52INT2 – P56INT6 External Interrupt INT2 – INT6 RST Reset input A low on this pin for two machine cycles while the oscillator is running resets the de- vice The port pins will be driven to their reset condi- tion when a voltage below VIL max voltage is ap- plied whether the oscillator is running or not An internal pullup resistor permits a power-on reset with only a capacitor connected to VSS ALEPROG Address Latch Enable output pulse for latching the low byte of the address during accesses to external memory This pin (ALEPROG) is also the program pulse input during programming of the 87C51GB In normal operation ALE is emitted at a constant rate of the oscillator frequency and may be used for external timing or clocking purposes Note how- ever that one ALE pulse is skipped during each ac- cess to external Data Memory If desired ALE operation can be disabled by setting bit 0 of SFR location 8EH With this bit set the pin is weakly pulled high However the ALE disable fea- ture will be suspended during a MOVX or MOVC in- struction idle mode power down mode and ICE mode The ALE disable feature will be terminated by reset When the ALE disable feature is suspended or terminated the ALE pin will no longer be pulled up weakly Setting the ALE-disable bit has no affect if the microcontroller is in external execution mode Throughout the remainder of this data sheet ALE will refer to the signal coming out of the ALEPROG pin and the pin will be referred to as the ALEPROG pin PSEN Program Store Enable is the read strobe to external Program Memory When the 8XC51GB is executing code from external Program Memory PSEN is activated twice each ma- chine cycle except that two PSEN activations are skipped during each access to external Data Memo- ry EA VPP External Access enable EA must be strapped to VSS in order to enable the device to fetch code from external Program Memory locations 0000H to 1FFFH Note however that if either of the Program Lock bits are programmed EA will be inter- nally latched on reset EA should be strapped to VCC for internal program executions 4 |
Codice articolo simile - 8XC51GB-1 |
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