AT89C51RD2 Atmel Corporation, AT89C51RD2 Datasheet - Page 124

• Manufacturer Part Number: AT89C51RD2
• Manufacturer: Atmel Corporation

Specifications of AT89C51RD2

• Flash (kbytes): 64 Kbytes
• Max. Operating Frequency: 60 MHz
• Cpu: 8051-12C
• Max I/o Pins: 32
• Spi: 1
• Uart: 1
• Sram (kbytes): 2
• Self Program Memory: API
• Operating Voltage (vcc): 2.7 to 5.5
• Timers: 4
• Isp: UART
• Watchdog: Yes

25.3.11
25.3.12
124
AT89C51RD2/ED2
Float Waveforms
Clock Waveforms
For timing purposes as port pin is no longer floating when a 100 mV change from load voltage
occurs and begins to float when a 100 mV change from the loaded V
≥ ± 20 mA.
Valid in normal clock mode. In X2 mode XTAL2 must be changed to XTAL2/2.
V
V
OH
OL
+ 0.1V
- 0.1V
FLOAT
V
LOAD
V
V
LOAD
LOAD
+ 0.1V
- 0.1V
OH
/V
OL
level occurs. I
4235K–8051–05/08
OL
/I
OH