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T89C51RD2-RLSI-L Datasheet(PDF) 1 Page - ATMEL Corporation |
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T89C51RD2-RLSI-L Datasheet(HTML) 1 Page - ATMEL Corporation |
1 / 86 page Rev. F - 15 February, 2001 1 T89C51RD2 0 to 40MHz Flash Programmable 8-bit Microcontroller 1. Description ATMEL Wireless and Microcontrollers T89C51RD2 is high performance CMOS Flash version of the 80C51 CMOS single chip 8-bit microcontroller. It contains a 64 Kbytes Flash memory block for program and for data. The 64 Kbytes Flash memory can be programmed either in parallel mode or in serial mode with the ISP capability or with software. The programming voltage is internally generated from the standard VCC pin. The T89C51RD2 retains all features of the ATMEL Wireless and Microcontrollers 80C52 with 256 bytes of internal RAM, a 7-source 4-level interrupt controller and three timer/counters. In addition, the T89C51RD2 has a Programmable Counter Array, an XRAM of 1024 bytes, an EEPROM of 2048 bytes, a Hardware Watchdog Timer, a more versatile serial channel that facilitates multiprocessor communication (EUART) and a speed improvement mechanism (X2 mode). Pinout is either the standard 40/ 44 pins of the C52 or an extended version with 6 ports in a 64/68 pins package. The fully static design of the T89C51RD2 allows to reduce system power consumption by bringing the clock frequency down to any value, even DC, without loss of data. The T89C51RD2 has 2 software-selectable modes of reduced activity for further reduction in power consumption. In the 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. The added features of the T89C51RD2 makes it more powerful for applications that need pulse width modulation, high speed I/O and counting capabilities such as alarms, motor control, corded phones, smart card readers. 2. Features • 80C52 Compatible • 8051 pin and instruction compatible • Four 8-bit I/O ports (or 6 in 64/68 pins packages) • Three 16-bit timer/counters • 256 bytes scratch pad RAM • 7 Interrupt sources with 4 priority levels • ISP (In System Programming) using standard V CC power supply. • Boot FLASH contains low level FLASH programming routines and a default serial loader • High-Speed Architecture • 40 MHz in standard mode • 20 MHz in X2 mode (6 clocks/machine cycle) • 64K bytes on-chip Flash program / data Memory • Byte and page (128 bytes) erase and write • 10k write cycles • On-chip 1024 bytes expanded RAM (XRAM) • Software selectable size (0, 256, 512, 768, 1024 bytes) • 768 bytes selected at reset for T87C51RD2 compatibility • Dual Data Pointer • Variable length MOVX for slow RAM/peripherals • Improved X2 mode with independant selection for CPU and each peripheral • 2 k bytes EEPROM block for data storage • 100K Write cycle • Programmable Counter Array with: • High Speed Output, • Compare / Capture, • Pulse Width Modulator, • Watchdog Timer Capabilities • Asynchronous port reset • Full duplex Enhanced UART • Low EMI (inhibit ALE) • Hardware Watchdog Timer (One-time enabled with Reset-Out) • Power control modes: • Idle Mode. • Power-down mode. |
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