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AT80C51SND1C-ROTIL 数据表(PDF) 6 Page - ATMEL Corporation |
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AT80C51SND1C-ROTIL 数据表(HTML) 6 Page - ATMEL Corporation |
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6 / 212 page  6 4109J–8051–10/06 AT8xC51SND1C Table 2. Clock Signal Description Table 3. Timer 0 and Timer 1 Signal Description P3.7:0 I/O Port 3 P3 is an 8-bit bidirectional I/O port with internal pull-ups. RXD TXD INT0 INT1 T0 T1 WR RD P4.7:0 I/O Port 4 P4 is an 8-bit bidirectional I/O port with internal pull-ups. MISO MOSI SCK SS P5.3:0 I/O Port 5 P5 is a 4-bit bidirectional I/O port with internal pull-ups. - Signal Name Type Description Alternate Function X1 I Input to the on-chip inverting oscillator amplifier To use the internal oscillator, a crystal/resonator circuit is connected to this pin. If an external oscillator is used, its output is connected to this pin. X1 is the clock source for internal timing. - X2 O Output of the on-chip inverting oscillator amplifier To use the internal oscillator, a crystal/resonator circuit is connected to this pin. If an external oscillator is used, leave X2 unconnected. - FILT I PLL Low Pass Filter input FILT receives the RC network of the PLL low pass filter. - Signal Name Type Description Alternate Function INT0 I Timer 0 Gate Input INT0 serves as external run control for timer 0, when selected by GATE0 bit in TCON register. External Interrupt 0 INT0 input sets IE0 in the TCON register. If bit IT0 in this register is set, bit IE0 is set by a falling edge on INT0. If bit IT0 is cleared, bit IE0 is set by a low level on INT0. P3.2 INT1 I Timer 1 Gate Input INT1 serves as external run control for timer 1, when selected by GATE1 bit in TCON register. External Interrupt 1 INT1 input sets IE1 in the TCON register. If bit IT1 in this register is set, bit IE1 is set by a falling edge on INT1. If bit IT1 is cleared, bit IE1 is set by a low level on INT1. P3.3 Signal Name Type Description Alternate Function |
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