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MC68HC908LD64 Datasheet, PDF (355/362 Pages) Freescale Semiconductor, Inc – Microcontrollers
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Electrical Specifications
FLASH Memory Characteristics
24.14 FLASH Memory Characteristics
Table 24-17. FLASH Memory Electrical Characteristics
Characteristic
Program bus clock frequency
FLASH block size
$0C00–$0FFF
$1000–F9FF
FLASH programming size
Read bus clock frequency
Page erase time
Mass erase time
PGM/ERASE to HVEN set up time
High-voltage hold time
High-voltage hold time (mass erase)
Program hold time
Program time
Return to read time
Symbol
—
—
—
—
fRead(1)
tErase(2)
tMErase(3)
tnvs
tnvh
tnvhl
tpgs
tPROG
trcv(4)
Min
Max
1
—
128
512
64
32 k
6M
10
—
10
—
5
—
5
—
100
—
20
—
20
40
1
—
Unit
MHz
Bytes
Bytes
Bytes
Hz
ms
ms
µs
µs
µs
ns
µs
µs
Cumulative program HV period
4,7616 bytes array
13K-bytes array
Row erase endurance(7)
Row program endurance(8)
Data retention time(9)
tHV(5)
—
tHV1(6)
—
—
10 k
—
10 k
—
10
6
ms
3
ms
—
Cycles
—
Cycles
—
Years
Notes:
1. fREAD is defined as the frequency range for which the FLASH memory can be read.
2. If the page erase time is longer than tErase (Min), there is no erase-disturb, but it reduces the endurance of the FLASH
memory.
3. If the mass erase time is longer than tMErase (Min), there is no erase-disturb, but it reduces the endurance of the FLASH
memory.
4. trcv is defined as the time it needs before the FLASH can be read after turning off the high voltage charge pump, by clearing
HVEN to logic 0.
5. tHV is defined as the cumulative high voltage programming time to the same row before next erase.
tHV must satisfy this condition: tnvs + tnvh + tpgs + (tPROG × 64) ≤ tHV max.
6. tHV1 is the tHV spec for 13K-bytes array
7. The minimum row endurance value specifies each row of the FLASH memory is guaranteed to work for at least this many
erase / program cycles.
8. The minimum row endurance value specifies each row of the FLASH memory is guaranteed to work for at least this many
erase / program cycles.
9. The FLASH is guaranteed to retain data over the entire operating temperature range for at least the minimum time
specified.
MC68HC908LD64 — Rev. 3.0
Freescale Semiconductor
Electrical Specifications
Data Sheet
355
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