AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 21

• Manufacturer Part Number: AT89C51RE2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RE2

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 34
• Spi: 1
• Uart: 2
• Sram (kbytes): 8.25
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART/OCD
• Watchdog: Yes

Memory Architecture
Physical memory
organisation
Figure 5. Physical memory organisation
7663E–8051–10/08
Fuse Configuration Byte(1 byte)
Hardware Security (1 byte)
Column Latches (128 bytes)
1FFFFh
00000h
AT89C51RE2 features several on-chip memories:
•
•
•
Flash memory:
containing 128 Kbytes of program memory (user space) organized into 128 bytes pages.
Boot ROM:
4K bytes for boot loader.
8K bytes internal XRAM
FCB
HSB
Flash memory
128K bytes
user space
FM0
256 bytes
4K bytes
8K bytes
XRAM
ROM
IRAM
RM0
AT89C51RE2
21