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DS89C420-MNL Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS89C420-MNL Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 58 page 1 of 58 051302 Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device may be simultaneously available through various sales channels. For information about device errata, click here: http://www.maxim-ic.com/errata. - FEATURES § 80C52 compatible − 8051 pin and instruction-set compatible − Four bidirectional I/O ports − Three 16-bit timer counters − 256 bytes scratchpad RAM § On-chip memory − 16kB flash memory − In-system programmable through serial port − 1kB SRAM for MOVX § ROMSIZE feature − Selects internal program memory size from 0 to 16k − Allows access to entire external memory map − Dynamically adjustable by software § High-speed architecture − 1 clock-per-machine cycle − DC to 33MHz operation − Single-cycle instruction in 30ns − Optional variable length MOVX to access fast/slow peripherals − Dual data pointers with auto increment/decrement and toggle select − Supports four paged modes § Power Management Mode − Programmable clock divider − Automatic hardware and software exit § Two full-duplex serial ports § Programmable watchdog timer § 13 interrupt sources (six external) § Five levels of interrupt priority § Power-fail reset § Early warning power-fail interrupt PIN ASSIGNMENT (Top View) www.maxim-ic.com DS89C420 Ultra-High-Speed Microcontroller P1.0/T2 P1.1/T2EX P1.2/RXD1 P1.3/TXD1 P1.4/INT2 P1.5/INT3 P1.6/INT4 P1.7/INT5 RST P3.0/RXD0 P3.1/TXD0 P3.2/INT0 P3.3/INT1 P3.4/T0 P3.5/T1 P3.6/WR P3.7/RD XTAL2 XTAL1 VSS VCC P0.0 P0.1 P0.2 P0.3 P0.4 P0.5 P0.6 P0.7 EA/VPP ALE/PROG PSEN P2.7 P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 6 1 40 18 28 7 39 17 29 DS89C420 44-Pin PLCC 33 23 1 11 34 22 44 12 DS89C420 44-Pin TQFP DS89C420 40-Pin DIP |
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