MC68HC08AZ60ACFU MOTOROLA [Motorola, Inc], MC68HC08AZ60ACFU Datasheet - Page 95
MC68HC08AZ60ACFU
Manufacturer Part Number
MC68HC08AZ60ACFU
Description
Microcontrollers
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC08AZ60ACFU.pdf
(480 pages)
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MC68HC08AZ60A — Rev 0.0
MOTOROLA
NOTE:
EEDIVSECD — EEPROM-2 Divider Security Disable
EEDIV[10:0] — EEPROM-2 Timebase Prescaler
The EE2DIV value is calculated by the following formula:
Where the result inside the bracket is rounded down to the nearest
integer value
For example, if the reference frequency is 4.9152MHz, the EE2DIV
value is 172
Programming/erasing the EEPROM-2 with an improper EE2DIV value
may result in data lost and reduce endurance of the EEPROM-2 device.
This bit enables/disables the security feature of the EE2DIV registers.
When EE2DIV security feature is enabled, the state of the registers
EE2DIVH and EE2DIVL are locked (including EEDIVSECD bit). The
EE2DIVHNVR and EE2DIVLNVR non-volatile memory registers are
also protected from being erased/programmed.
These prescaler bits store the value of EE2DIV which is used as the
divisor to derive a timebase of 35 s from the selected reference clock
source (CGMXCLK or bus clock in the MORB register) for the
EEPROM-2 related internal timer and circuits. EE2DIV[10:0] bits are
readable at any time. They are writable when EELAT = 0 and
EEDIVSECD = 1.
EE2DIV= INT[Reference Frequency(Hz) x 35 x10
1 = EE2DIV security feature disabled
0 = EE2DIV security feature enabled
EEPROM-2
EEPROM-2 Register Descriptions
-6
Advance Information
+0.5]
EEPROM-2
95
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