AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 171

• 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

External Program
Memory Read Cycle
External Data Memory
Characteristics
7663E–8051–10/08
PORT 0
PORT 2
PSEN
ALE
INSTR IN
OR SFR-P2
ADDRESS
Table 122. Symbol Description
Symbol
T
T
T
T
T
T
T
T
T
T
T
T
T
T
WLWH
QVWX
QVWH
WHQX
WHLH
RHDX
RHDZ
AVWL
RLRH
RLDV
AVDV
LLWL
RLAZ
LLDV
T
LHLL
T
T
LLAX
AVLL
A0-A7
Parameter
RD Pulse Width
WR Pulse Width
RD to Valid Data In
Data Hold After RD
Data Float After RD
ALE to Valid Data In
Address to Valid Data In
ALE to WR or RD
Address to WR or RD
Data Valid to WR Transition
Data Set-up to WR High
Data Hold After WR
RD Low to Address Float
RD or WR High to ALE high
T
AVIV
ADDRESS A8-A15
T
LLIV
T
LLPL
TPLAZ
T
PLIV
T
PLPH
INSTR IN
T
PXIX
12 T
CLCL
T
PXIZ
T
PXAV
A0-A7
ADDRESS A8-A15
AT89C51RE2
INSTR IN
171