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AT80C51RB2-3CSUM Datasheet(PDF) 4 Page - ATMEL Corporation |
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AT80C51RB2-3CSUM Datasheet(HTML) 4 Page - ATMEL Corporation |
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4 / 83 page  4 AT80C51RD2/AT83C51Rx2 4113B–8051–03/05 Table 2. Pin Description Mnemonic Pin Number Type Name and Function DIL PLCC44 VQFP44 1.4 V SS 20 22 16 I Ground: 0V reference V CC 40 44 38 I Power Supply: This is the power supply voltage for normal, idle and power-down operation P0.0 - P0.7 39 - 32 43 - 36 37 - 30 I/O Port 0: Port 0 is an open-drain, bi-directional I/O port. Port 0 pins that have 1s written to them float and can be used as high impedance inputs. Port 0 must be polarized to V CC or VSS in order to prevent any parasitic current consumption. Port 0 is also the multiplexed low-order address and data bus during access to external program and data memory. In this application, it uses strong internal pull-up when emitting 1s. Port 0 also inputs the code bytes during EPROM programming. External pull-ups are required during program verification during which P0 outputs the code bytes. P1.0 - P1.7 1 - 8 2 - 9 40 - 44 1 - 3 I/O Port 1: Port 1 is an 8-bit bi-directional I/O port with internal pull-ups. Port 1 pins that have 1s written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, Port 1 pins that are externally pulled low will source current because of the internal pull-ups. Port 1 also receives the low-order address byte during memory programming and verification. Alternate functions for T89C51RB2/RC2 Port 1 include: 12 40 I/O P1.0: Input/Output I/O T2 (P1.0): Timer/Counter 2 external count input/Clockout 23 41 I/O P1.1: Input/Output I T2EX: Timer/Counter 2 Reload/Capture/Direction Control 34 42 I/O P1.2: Input/Output I ECI: External Clock for the PCA 45 43 I/O P1.3: Input/Output I/O CEX0: Capture/Compare External I/O for PCA module 0 56 44 I/O P1.4: Input/Output I/O CEX1: Capture/Compare External I/O for PCA module 1 67 1 I/O P1.5: Input/Output I/O CEX2: Capture/Compare External I/O for PCA module 2 78 2 I/O P1.6: Input/Output I/O CEX3: Capture/Compare External I/O for PCA module 3 89 3 I/O P1.7: Input/Output: I/O CEX4: Capture/Compare External I/O for PCA module 4 XTAL1 19 21 15 I Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. XTAL2 18 20 14 O Crystal 2: Output from the inverting oscillator amplifier |
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