MC68HC08AB16AD datasheet(74/380 Pages) FREESCALE

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Technical Data

MC68HC08AB16A — Rev. 2.1

Freescale Semiconductor

Where the result inside the bracket is rounded down to the nearest

integer value.

For example, if the reference frequency is 4.9152MHz, the EEDIV

value is 172.

NOTE:

Programming/erasing the EEPROM with an improper EEDIV value may

result in data lost and reduce endurance of the EEPROM device.

5.11.3.1 EEPROM Timebase Divider Mask Option Register

The 16-bit EEPROM timebase divider mask option register consists of

two 8-bit read-only registers: EEDIVHMOR and EEDIVLMOR. The

contents of these two registers are respectively loaded into the

EEPROM timebase divider registers, EEDIVH and EEDIVL, after a

reset.

These two registers are hard-wired connections specified at the same

time as the ROM code.

Address:

$FE10

Bit 7

654321

Bit 0

Read: EEDIVSECD

RRRR

EEDIV10

EEDIV9

EEDIV8

Write:

Reset:

Unaffected by reset; mask option

Figure 5-7. EEPROM Divider Mask Option Register High

(EEDIVHMOR)

Address:

$FE11

Bit 7

654321

Bit 0

Read: EEDIV7

EEDIV6

EEDIV5

EEDIV4

EEDIV3

EEDIV2

EEDIV1

EEDIV0

Write:

Reset:

Unaffected by reset; mask option

Figure 5-8. EEPROM Divider Mask Option Register Low

(EEDIVLMOR)

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