at89c51re2-slsem ATMEL Corporation, at89c51re2-slsem Datasheet - Page 160

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

Flash Memory
7663B–8051–03/07
Table 107. Timing Symbol Definitions
Table 108. Memory AC Timing
VDD = 3V to 5.5V, TA = -40 to +85°C
Figure 53. Flash Memory – ISP Waveforms
Figure 54. Flash Memory – Internal Busy Waveforms
S (Hardware
condition)
R
B
Symbol
T
T
T
N
T
SVRL
RLSX
BHBL
FDR
FCY
PSEN#1
FBUSY bit
RST
Signals
Parameter
Input PSEN# Valid to RST Edge
Input PSEN# Hold after RST Edge
Flash Internal Busy (Programming) Time
Number of Flash Erase/Write Cycles
Flash Retention Time
PSEN#,EA
RST
FBUSY flag
T
SVRL
T
BHBL
T
RLSX
100 000
L
V
X
Min
50
50
10
Typ
10
Conditions
Low
Valid
No Longer Valid
Max
cycles
Unit
years
ms
ns
ns
143