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8XL51FA Datasheet(PDF) 4 Page - Intel Corporation |
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8XL51FA Datasheet(HTML) 4 Page - Intel Corporation |
4 / 20 page 8XL51FAFBFC PIN DESCRIPTIONS VCC Supply voltage VSS Circuit ground Port 0 Port 0 is an 8-bit open drain bidirectional IO port As an output port each pin can sink several inputs Port 0 pins that have 1’s written to them float and in that state can be used as high-impedance inputs Port 0 is also the multiplexed low-order address and data bus during accesses to external Program and Data Memory In this application it uses strong inter- nal pullups when emitting 1’s and can source and sink several inputs Port 0 also receives the code bytes during OTP ROM programming and outputs the code bytes dur- ing program verification External pullup resistors are required during program verification Port 1 Port 1 is an 8-bit bidirectional IO port with internal pullups The Port 1 output buffers can drive several inputs Port 1 pins that have 1’s written to them are pulled high by the internal pullups and in that state can be used as inputs As inputs Port 1 pins that are externally pulled low will source current (IIL on the data sheet) because of the internal pull- ups In addition Port 1 serves the functions of the follow- ing special features of the 8XL51FX Port Pin Alternate Function P10 T2 (External Count Input to Timer Counter 2) Clock Out P11 T2EX (TimerCounter 2 Capture Reload Trigger and Direction Control) P12 ECI (External Count Input to the PCA) P13 CEX0 (External IO for Compare Capture Module 0) P14 CEX1 (External IO for Compare Capture Module 1) P15 CEX2 (External IO for Compare Capture Module 2) P16 CEX3 (External IO for Compare Capture Module 3) P17 CEX4 (External IO for Compare Capture Module 4) Port 1 receives the low-order address bytes during OTP ROM programming and verifying Port 2 Port 2 is an 8-bit bidirectional IO port with internal pullups The Port 2 output buffers can drive several inputs Port 2 pins that have 1’s written to them are pulled high by the internal pullups and in that state can be used as inputs As inputs Port 2 pins that are externally pulled low will source current (IIL on the data sheet) because of the internal pull- ups Port 2 emits the high-order address byte during fetches from external Program Memory and during accesses to external Data Memory that use 16-bit addresses (MOVX DPTR) In this application it uses strong internal pullups when emitting 1’s Dur- ing accesses to external Data Memory that use 8-bit addresses (MOVX Ri) Port 2 emits the contents of the P2 Special Function Register Some Port 2 pins receive the high-order address bits during OTP ROM programming and program verifi- cation Port 3 Port 3 is an 8-bit bidirectional IO port with internal pullups The Port 3 output buffers can drive several inputs Port 3 pins that have 1’s written to them are pulled high by the internal pullups and in that state can be used as inputs As inputs Port 3 pins that are externally pulled low will source current (IIL on the data sheet) because of the pullups Port 3 also serves the functions of various special features of the MCS 51 microcontroller family as listed below Port Pin Alternate Function P30 RXD (serial input port) P31 TXD (serial output port) P32 INT0 (external interrupt 0) P33 INT1 (external interrupt 1) P34 T0 (Timer 0 external input) P35 T1 (Timer 1 external input) P36 WR (external data memory write strobe) P37 RD (external data memory read strobe) RST Reset input A high 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 minimum VIH2 voltage is applied wheth- er the oscillator is running or not An internal pull- down resistor permits a power-on reset with only a capacitor connected to VCC 4 |
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Descripción similar - 8XL51FA |
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