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AT89C51ID2-RDTIM Datasheet(PDF) 3 Page - ATMEL Corporation |
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AT89C51ID2-RDTIM Datasheet(HTML) 3 Page - ATMEL Corporation |
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3 / 159 page  3 AT89C51ID2 4289A–8051–09/03 Block Diagram Figure 1. Block Diagram Timer 0 INT RAM 256x8 WR RD EA PSEN ALE/ XTALA2 XTALA1 EUART CPU Timer 1 Ctrl (2) (2) C51 CORE (2) (2) (2) (2) Port 0 Port 1Port 2 Port 3 XRAM 1792 x 8 IB-bus PCA PROG Watch Dog (2) (2) (1) (1): Alternate function of Port 1 (2): Alternate function of Port 3 (1) Timer2 (1) (1) Flash 64Kx8 Keyboard (1) (3): Alternate function of Port I2 (3) (3) Port4 (1) (1)(1)(1) BOOT 2K x8 ROM Regulator POR / PFD Port 5 Parallel I/O Ports & External Bus SPI TWI E² DATA 2K x 8 POR PFD XTALB2 XTALB1(1) |
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