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AT83SND2C Datasheet(PDF) 5 Page - ATMEL Corporation |
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AT83SND2C Datasheet(HTML) 5 Page - ATMEL Corporation |
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5 / 236 page  5 AT8xC51SND2C 4341E–MP3–06/05 Signals All the AT8xC51SND2C signals are detailed by functionality in Table 1 to Table 14. Table 1. Ports Signal Description Table 2. Clock Signal Description Table 3. Timer 0 and Timer 1 Signal Description Signal Name Type Description Alternate Function P0.7:0 I/O Port 0 P0 is an 8-bit open-drain bidirectional I/O port. Port 0 pins that have 1s written to them float and can be used as high impedance inputs. To avoid any parasitic current consumption, floating P0 inputs must be polarized to V DD or VSS. AD7:0 P2.7:0 I/O Port 2 P2 is an 8-bit bidirectional I/O port with internal pull-ups. A15:8 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 P4.3:0 I/O Port 4 P4 is an 8-bit bidirectional I/O port with internal pull-ups. MISO MOSI SCK SS 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 |
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