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AT89C5131A-RDTUM Datasheet(PDF) 9 Page - ATMEL Corporation |
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AT89C5131A-RDTUM Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 188 page  9 4337K–USB–04/08 AT89C5130A/31A-M Table 3-8. Ports Signal Description Table 3-9. Clock 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 pulled to V DD or V SS. AD[7:0] P1[7:0] I/O Port 1 P1 is an 8-bit bidirectional I/O port with internal pull-ups. KIN[7:0] T2 T2EX ECI CEX[4:0] P2[7:0] I/O Port 2 P2 is an 8-bit bidirectional I/O port with internal pull-ups. A[15:8] P3[7:0] I/O Port 3 P3 is an 8-bit bidirectional I/O port with internal pull-ups. LED[3:0] RxD TxD INT0 INT1 T0 T1 WR RD P4[1:0] I/O Port 4 P4 is an 2-bit open drain port. SCL SDA Signal Name Type Description Alternate Function XTAL1 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. - XTAL2 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 XTAL2 unconnected. - PLLF I PLL Low Pass Filter input Receive the RC network of the PLL low pass filter. - |
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