AT89C52 AVR Microcontroller

Description

DataSheet: ? AT89C52 Datasheet.pdf AT89C52? is an 8-bit? microcontroller ?and belongs to Atmel’s? 8051 family . AT89C52 has 8KB of Flash programmable and erasable read only memory (PEROM) and 256 bytes of RAM. AT89C52 has an endurance of 1000 Write/Erase cycles which means that it can be erased and programmed to a maximum of 1000 times. Though very slight difference between the features of? AT89C51 ?and? AT89C52 , they are very similar in their pin configurations* and operations. The? differences between AT89C51 and AT89C52 ?have been tabulated below. AT89C52 AT89C51 RAM 256 Bytes 128 Bytes Flash 8 KB 4 KB Number of Timers/Counters 3 (16-bit each) 2 (16-bit each) Number of Interrupt Sources 8 6 *The? pin configuration of AT89C52 ?is exactly similar to that of AT89C51 except that the first two pins, P1.0 and P1.1 are multiplexed to correspond to Timer2 operations as given in the following table. Existing Alternate Function P1.0 T2 Timer/counter 2 External Count input P1.1 T2 EX Timer/counter 2 Trigger input While AT89C51 has two timers (Timer0 & Timer1), AT89C52 also has Timer2. Corresponding to Timer2, there are extra SFRs (Special Function Registers) T2CON & T2MOD. Also there are registers RCAP2H & RCAP2L to configure 16 bit Capture & Auto-reload modes of Timer2. Pin Diagram: Pin Description: Pin No Function Name 1 External count input to Timer/Counter 2, clock-out T 2 P 1 .0 2 Timer/Counter 2 capture/reload trigger and direction control T 2 ?EX P 1 .1 3 8 bit input/output port (P 1 ) pins P 1 .2 4 P 1 .3 5 P 1 .4 6 P 1 .5 7 P 1 .6 8 P 1 .7 9 Reset pin; Active high Reset 10 Input (receiver) for serial communication RxD 8 bit input/output port (P 3 ) pins P 3 .0 11 Output (transmitter) for serial communication TxD P 3 .1 12 External interrupt 1 Int0 P 3 .2 13 External interrupt 2 Int1 P 3 .3 14 Timer1 external input T 0 P 3 .4 15 Timer2 external input T 1 P 3 .5 16 Write to external data memory Write P 3 .6 17 Read from external data memory Read P 3 .7 18 Quartz crystal oscillator (up to 24 MHz) Crystal 2 19 Crystal 1 20 Ground (0V) Ground 21 8 bit input/output port (P 2 ) pins / High-order address bits when interfacing with external memory P 2 .0/ A 8 22 P 2 .1/ A 9 23 P 2 .2/ A 10 24 P 2 .3/ A 11 25 P 2 .4/ A 12 26 P 2 .5/ A 13 27 P 2 .6/ A 14 28 P 2 .7/ A 15 29 Program store enable;?Read from external program memory PSEN 30 Address Latch Enable ALE Program pulse input during Flash programming Prog 31 External Access Enable; ?Vcc for internal program executions EA Programming enable voltage; 12V (during Flash programming) Vpp 32 8 bit input/output port (P 0 ) pins Low-order address bits when interfacing with external memory P 0 .7/ AD 7 33 P 0 .6/ AD 6 34 P 0 .5/ AD 5 35 P 0 .4/ AD 4 36 P 0 .3/ AD 3 37 P 0 .2/ AD 2 38 P 0 .1/ AD 1 39 P 0 .0/ AD 0 40 Supply voltage; 5V (up to 6.6V) Vcc

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