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MC68HC908GR8 Datasheet, PDF (268/286 Pages) Freescale Semiconductor, Inc – M68HC08 Microcontrollers
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Electrical Specifications
23.15 Timer Interface Module Characteristics
Characteristic
Symbol
Min
Max
Unit
Input capture pulse width
tTIH, tTIL
2
—
tcyc
Timer input capture period
tTLTL
See Note(1)
—
tcyc
1. The minimum period is the number of cycles it takes to execute the interrupt service routine plus 1 tcyc.
23.16 Memory Characteristics
Characteristic
RAM data retention voltage
FLASH program bus clock frequency
FLASH read bus clock frequency
FLASH page erase time
Limited endurance (<1 K cycles)
Maximum endurance (> 1 K cycles)
FLASH mass erase time
FLASH PGM/ERASE to HVEN set up time
FLASH high-voltage hold time
FLASH high-voltage hold time (mass erase)
FLASH program hold time
FLASH program time
FLASH return to read time
FLASH cumulative program HV period
FLASH endurance(4)
FLASH data retention time(5)
Symbol
Min
VRDR
1.3
—
1
fRead(1)
32k
Typ
Max
Unit
—
—
V
—
—
MHz
—
8.4 M
Hz
tErase
0.9
1
1.1
ms
3.6
4
5.5
tMErase
4
—
—
ms
tnvs
10
—
—
μs
tnvh
5
—
—
μs
tnvhl
100
—
—
μs
tpgs
5
—
—
μs
tPROG
30
—
40
μs
trcv(2)
1
—
—
μs
tHV(3)
—
—
4
ms
—
10k
100k
—
Cycles
—
15
100
—
Years
1. fRead is defined as the frequency range for which the FLASH memory can be read.
2. 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 0.
3. 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.
4. Typical endurance was evaluated for this product family. For additional information on how Freescale defines typical
Endurance, please refer to Engineering Bulletin EB619.
5. Typical data retention values are based on intrinsic capability of the technology measured at high temperature and de-rated
to 25°C using the Arrhenius equation. For additional information on how Freescale defines Typical Data Retention, please
refer to Engineering Bulletin EB618.
MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7
268
Freescale Semiconductor
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