MC908AB32CFUE Datasheet, PDF (83/392 Pages) Freescale Semiconductor, Inc – Microcontrollers

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
6
5
4
3
2
1
Bit 0
Read:
EEDIVSECD
R
R
R
R 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
6
5
4
3
2
1
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)
MC68HC908AB32 — Rev. 1.1
Freescale Semiconductor
EEPROM
Technical Data
83