MC908AB32CFUE datasheet(83/392 Pages) FREESCALE

83 / 392 page

EEPROM

MC68HC908AB32 — Rev. 1.1

Technical Data

Freescale Semiconductor

EEPROM

The EEDIV value is calculated by the following formula:

EEDIV = INT

[Reference frequency (Hz) × 35 × 10–6 + 0.5]

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 Non-Volatile Register

The 16-bit EEPROM timebase divider non-volatile register consists of

two 8-bit registers: EEDIVHNVR and EEDIVLNVR. 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 erased and programmed in the same way as an

EEPROM byte.

Address:

$FE10

Bit 7

654321

Bit 0

Read:

EEDIVSECD

RRRR

EEDIV10

EEDIV9

EEDIV8

Write:

Reset:

Unaffected by reset; $FF when blank

Figure 5-7. EEPROM Divider Non-volatile Register High(EEDIVHNVR)

Address:

$FE11

Bit 7

654321

Bit 0

Read:

EEDIV7

EEDIV6

EEDIV5

EEDIV4

EEDIV3

EEDIV2

EEDIV1

EEDIV0

Write:

Reset:

Unaffected by reset; $FF when blank

Figure 5-8. EEPROM Divider Non-volatile Register Low (EEDIVLNVR)

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