AT89C51RE2 Atmel Corporation, AT89C51RE2 Datasheet - Page 174

• 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 Data Memory Read Cycle
Serial Port Timing -
Shift Register Mode
174
AT89C51RE2
PORT 0
PORT 2
ALE
PSEN
RD
OR SFR-P2
ADDRESS
Table 125. Symbol Description
Table 126. AC Parameters for a Fix Clock
Notes:
Symbol
T
T
T
T
T
Symbol
QVHX
XHQX
XHDX
XHDV
XLXL
1. ‘ -L ‘ refers to 2V - 5.5V version.
2. ‘ -M ’ refers to 4.5V to 5.5V version.
T
T
T
T
T
QVHX
XHQX
XHDX
XHDV
XLXL
A0-A7
T
Parameter
Serial port clock cycle time
Output data set-up to clock rising edge
Output data hold after clock rising edge
Input data hold after clock rising edge
Clock rising edge to input data valid
Min
LLAX
T
300
200
30
AVWL
0
T
LLWL
T
-M
AVDV
T
(1)
LLDV
ADDRESS A8-A15 OR SFR P2
Max
117
T
RLAZ
T
RLRH
Min
300
200
30
0
DATA IN
-L
T
(2)
T
WHLH
RHDX
Max
117
T
RHDZ
7663E–8051–10/08
Units
ns
ns
ns
ns
ns