MC68HC908AB32CFU Freescale Semiconductor, MC68HC908AB32CFU Datasheet - Page 83

• Manufacturer Part Number: MC68HC908AB32CFU
• Description: IC MCU 8MHZ 32K FLASH 64-QFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC68HC908AB32CFU

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8MHz
• Connectivity: SCI, SPI
• Peripherals: POR, PWM
• Number Of I /o: 51
• Program Memory Size: 32KB (32K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 8x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

5.11.3.1 EEPROM Timebase Divider Non-Volatile Register
MC68HC908AB32
Freescale Semiconductor
NOTE:
—
Rev. 1.1
Figure 5-7. EEPROM Divider Non-volatile Register High(EEDIVHNVR)
Figure 5-8. EEPROM Divider Non-volatile Register Low (EEDIVLNVR)
Address:
Address:
Programming/erasing the EEPROM with an improper EEDIV value may
result in data lost and reduce endurance of the EEPROM device.
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.
Reset:
Reset:
Read:
Read:
Write:
Write:
The EEDIV 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 EEDIV
value is 172.
EEDIV = INT
EEDIVSECD
EEDIV7
$FE10
$FE11
Bit 7
Bit 7
EEDIV6
R
6
6
[
EEPROM
Reference frequency (Hz) × 35 × 10
EEDIV5
R
5
Unaffected by reset; $FF when blank
5
Unaffected by reset; $FF when blank
EEDIV4
R
4
4
EEDIV3
R
3
3
EEDIV10
EEDIV2
2
2
EEDIV9
EEDIV1
–6
1
1
Technical Data
+ 0.5
EEPROM
EEDIV8
EEDIV0
]
Bit 0
Bit 0
83