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AT83C51RC2 Datasheet(PDF) 2 Page - ATMEL Corporation |
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AT83C51RC2 Datasheet(HTML) 2 Page - ATMEL Corporation |
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2 / 86 page  2 4113C–8051–01/08 AT8xc51Rx2 1. Description AT8xC51Rx2 microcontrollers are high performance ROM versions of the 80C51 8-bit microcon- trollers. They contain a 0K, 16K or 32K bytes ROM memory block for program. The microcontrollers retain all features of the Atmel 80C52 with 256 bytes of internal RAM, a 7- source 4-level interrupt controller and three timer/counters. In addition, the microcontrollers have a Programmable Counter Array, an XRAM of 1024 byte, a Hardware Watchdog Timer, a Keyboard Interface, a more versatile serial channel that facilitates multiprocessor communication (EUART) and a speed improvement mechanism (X2 mode). The microcontrollers have 2 software-selectable modes of reduced activity and 8 bit clock pres- caler for further reduction in power consumption. In Idle mode, the CPU is frozen while the peripherals and the interrupt system are still operating. In the Power-down mode, the RAM is saved and all other functions are inoperative. Table 1. Memory Size 2. Block Diagram Notes: 1. Alternate function of Port 1 2. Alternate function of Port 3 ROM (Bytes) XRAM (Bytes) TOTAL RAM (Bytes) I/O AT83C51RB2 16K 1024 1280 32 AT83C51RC2 32K 1024 1280 32 AT80C51RD2 ROMless 1024 1280 32 Timer 0 INT RAM 256x8 WR RD EA PSEN ALE/ XTAL2 XTAL1 EUART CPU Timer 1 Ctrl (2) (2) C51 CORE (2) (2) (2) (2) Port 0 Port 1 Port 2 Port 3 Parallel I/O Ports & Ext. Bus XRAM 1Kx8 IB-bus PCA PROG Watch Dog (2) (2) (1) (1) Timer2 (1) (1) ROM 32Kx8 or 16Kx8 Key Board + BRG |
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