at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 2

• Manufacturer Part Number: at89c51re2-slsem
• Description: At89c51re2 8-bit Flash Microcontroller
• Manufacturer: ATMEL Corporation

Description
2
AT89C51RE2
AT89C51RE2 is a high performance CMOS Flash version of the 80C51 CMOS single
chip 8-bit microcontroller. It contains a 128 Kbytes Flash memory block for program.
The 128 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 V
The AT89C51RE2 retains all features of the Atmel 80C52 with 256 bytes of internal
RAM, a 10-source 4-level interrupt controller and three timer/counters.
In addition, the AT89C51RE2 has a Programmable Counter Array, an XRAM of 8192
bytes, a Hardware Watchdog Timer, SPI and Keyboard, two serial channels that facili-
tates multiprocessor communication (EUART), a speed improvement mechanism (X2
mode) and an extended stack mode that allows the stack to be extended in the lower
256 bytes of XRAM.
The fully static design of the AT89C51RE2 allows to reduce system power consumption
by bringing the clock frequency down to any value, even DC, without loss of data.
The AT89C51RE2 has 2 software-selectable modes of reduced activity and 8-bit clock
prescaler 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 AT89C51RE2 make 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.
Table 1. Memory Size and I/O pins
Note:
AT89C51RE2
VQFP64
PLCC44
VQFP44
1. For VQFP64 packages, please contact Atmel sales offices for availability.
(1)
Flash (bytes)
128K
128K
CC
pin.
XRAM (bytes)
8192
8192
TOTAL RAM
8192 + 256
8192 + 256
(bytes)
7663B–8051–03/07
I/O
34
50