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T89C51RC2-SLSCM Datasheet(PDF) 6 Page - ATMEL Corporation |
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T89C51RC2-SLSCM Datasheet(HTML) 6 Page - ATMEL Corporation |
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6 / 117 page  6 T89C51RB2/RC2 4105D–8051–10/06 Table 3. Pin Description for 40 - 44 Pin Packages Mnemonic Pin Number Type Name and Function DIL LCC VQFP44 1.4 VSS 20 22 16 I Ground: 0V reference VCC 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, bidirectional 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 VCC 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 FLASH 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 bidirectional 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: 1 2 40 I/O P1.0: Input / Output I/O T2 (P1.0): Timer/Counter 2 external count input/Clockout 2 3 41 I/O P1.1: Input / Output I T2EX: Timer/Counter 2 Reload/Capture/Direction Control I SS: SPI Slave Select 3 4 42 I/O P1.2: Input / Output I ECI: External Clock for the PCA 4 5 43 I/O P1.3: Input / Output I/O CEX0: Capture/Compare External I/O for PCA module 0 5 6 44 I/O P1.4: Input / Output I/O CEX1: Capture/Compare External I/O for PCA module 1 6 7 1 I/O P1.5: Input / Output I/O CEX2: Capture/Compare External I/O for PCA module 2 I/O MISO: SPI Master Input Slave Output line When SPI is in master mode, MISO receives data from the slave peripheral. When SPI is in slave mode, MISO outputs data to the master controller. 7 8 2 I/O P1.6: Input / Output I/O CEX3: Capture/Compare External I/O for PCA module 3 I/O SCK: SPI Serial Clock SCK outputs clock to the slave peripheral 8 9 3 I/O P1.7: Input / Output: |
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