AN2156 Freescale Semiconductor / Motorola, AN2156 Datasheet - Page 6

• Manufacturer Part Number: AN2156
• Description: Programming and Erasing FLASH and EEPROM Memories on the MC68HC908AS60A/AZ60A
• Manufacturer: Freescale Semiconductor / Motorola

Application Note
6
EExDIVHNVR
EExDIVH
EEDIVCLK bit
EEBCLK bit in EEPROM
Timebase reference
Algorithm
Bit-erased state
Programming time per byte
Erasing time per byte
Erasing time per block
Erasing time for bulk
Successive programming
Recovery time for lower
Write/erase cycles
Data retention
and EExDIVLNVR
registers
and EExDIVL registers
in CONFIG-2
control register
clock frequency
power consumption
EEPROM bus clock
Fixed delays
“1”
Minimum 10 ms
Minimum 10 ms
Minimum 10 ms
Minimum 10 ms
Erase operation is not
Recovery time is required to
Minimum 10,000 cycles
Minimum 10 years
Freescale Semiconductor, Inc.
selection (bus clock or
internal RC oscillator)
necessary before
programming.
stabilize after clearing
EEOFF bit or recovering
from stop mode.
MC68HC908AS60/AZ60
For More Information On This Product,
Table 3. EEPROM Differences
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N/A
N/A
N/A
N/A
The value programmed in these registers is
These registers can either be loaded from the
Timebase reference clock selection
250 kHz–16 MHz
— The MC68HC908AS60/AZ60 EEPROM
— Program/erase cycle is terminated by the
“1”
Minimum 10 ms for standard mode
Minimum 10 ms for standard mode
Minimum 10 ms for standard mode
Minimum 10 ms for standard mode
Erase operation is required before programming.
Recovery time is not required.
Minimum 10,000 cycles
Minimum 10 years
automatically loaded into the EExDIVH/L
registers on reset.
EExDIVH/LNVR registers or must be written to
directly to set up a constant 35- s timebase.
(bus clock or CGMXCLK)
algorithm can be used. However, the EEDIV
initialization is required to set proper prescaler
value.
internal time in auto mode.
The same byte may be successively
programmed only if selective bit programming is
used.
MC68HC908AS60A/AZ60A
N/A
MOTOROLA
AN2156