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8XC51SL 数据表(PDF) 4 Page - Intel Corporation |
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8XC51SL 数据表(HTML) 4 Page - Intel Corporation |
4 / 23 page 8XC51SLLOW VOLTAGE 8XC51SL PIN DESCRIPTIONS Table 1 Pin Descriptions Symbol Type Description VSS Circuit ground potential VCC Supply voltage during normal Idle and Power-Down operation nominally a5V g 10% for 8XC51SL a33V g 03V for Low Voltage 8XC51SL PCDB0 – 7 IO Host interface data bus An 8-bit bidirectional port for data transfers between the host processor and the keyboard controller WRL I The active-low host-interface write signal RDL I The active-low host-interface read signal CSL I The active-low host-interface chip select A0 – A1 I Host-Interface Address select inputs PCOBF O The active-high host-interface Output Buffer Full interrupt GATEA20 O Gate A20 control signal output RCLPROGL O Host resetactive low This pin is also the program pulse input during EPROM programming LED0 – 3 O LED output drivers KSI0 – 7 I Keyboard input scan lines (input Port 0) Schmitt inputs with 5K – 20K pull-up resistors KSO0 – 15 O Keyboard output scan lines PORT 1 IO Port 1 is a general-purpose 8-bit bidirectional port with internal pull-ups It also supports the following user-selectable functions P10A0 – P10 – P16 are available for connection to dedicated keyboard inputs A0 – A7 output the low-order address byte (refer to LOADREN signal) P17A7 LOADREN I Low address enable When set high address bits A0 – A7 are output on P10 – P17 PORT2 IO Port 2 is a general-purpose 8-bit bidirectional port with internal pull-ups on P20 – 6 A8 – 14 It also supports the following user-selectable functions P20 – 6A8 – 14 P20 – 6A8 – 14 output the high-order address byte P27LED4 P27LED4 is available as a fifth LED output driver (by writing to the port bit 7) PORT 3 IO Port 3 is a general-purpose 8-bit bidirectional port P32INT0 P34T0 P36WRL and P37RDL have internal pull-ups P30SIF00 P31SIF01 P33SIF10 and P35SIF11 are high-drive open-drain outputs It also supports the following user- selectable functions P30SIF00 A high-drive open-drain output to support an external serial keyboard interface (typically CLK) RXD (8051 UART serial input port) SIF0INTL (serial interface interrupt 0) P31SIF01 A high-drive open-drain output to support an external serial keyboard interface (typically DATA) TXD (8051 UART serial output port) P32INT0 INT0L (external interrupt 0) P33SIF10 A high-drive open-drain output to support an external serial keyboard interface (typically mouse CLK) SIF1INTL (external interrupt 1) P34T0 AUXOBF1 (output buffer fullmouse support) T0 (TimerCounter 0 external input) P35SIF11 A high-drive open-drain output to support an external serial keyboard interface (typically mouse DATA) T1 (TimerCounter 1 external input) P36WRL WRL (external data memory write strobe) inactive at addresses 7FF0 – 7FFFH P37RDL AUXOBF2 (output buffer full interrupt) INT2L (external interrupt) RDL (external data memory read strobe) inactive at addresses 7FF0 – FFFFH 4 |
类似零件编号 - 8XC51SL |
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类似说明 - 8XC51SL |
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