32
4173ES–USB–09/07
AT89C5132
6.3.8
Flash Memory
6.3.8.1
Definition of Symbols
Table 19. Flash Memory Timing Symbol Definitions
6.3.8.2
Timings
Table 20. Flash Memory AC Timing
V
DD
= 2.7 to 3.3V, T
A
= -40
°
to +85
°
C
6.3.8.3
Waveforms
Figure 6-21. Flash Memory – ISP Waveforms
Note:
1. ISP must be driven through a pull-down resistor (see Section “In-system Programming”,
Figure 6-22. Flash Memory – Internal Busy Waveforms
6.3.9
External Clock Drive and Logic Level References
6.3.9.1
Definition of Symbols
Table 21. External Clock Timing Symbol Definitions
Signals
Conditions
S
ISP
L
Low
R
RST
V
Valid
B
FBUSY flag
X
No Longer Valid
Symbol
Parameter
Min
Typ
Max
Unit
T
SVRL
Input ISP Valid to RST Edge
50
ns
T
RLSX
Input ISP Hold after RST Edge
50
ns
T
BHBL
FLASH Internal Busy (Programming) Time
10
ms
N
FCY
Number of Flash Write Cycles
100K
Cycle
T
FDR
Flash Data Retention Time
10
Year
RST
T
SVRL
ISP
(1)
T
RLSX
FBUSY bit
T
BHBL
Signals
Conditions
C
Clock
H
High
L
Low
X
No Longer Valid