MC68HC908AB32 MOTOROLA [Motorola, Inc], MC68HC908AB32 Datasheet - Page 81

• Manufacturer Part Number: MC68HC908AB32
• Description: HCMOS Microcontroller Unit
• Manufacturer: MOTOROLA [Motorola, Inc]

MC68HC908AB32
MOTOROLA
—
Rev. 1.0
Address:
Address:
These two read/write registers are respectively loaded with the contents
of the EEPROM timebase divider non-volatile registers (EEDIVHNVR
and EEDIVLNVR) after a reset.
EEDIVSECD — EEPROM Divider Security Disable
EEDIV[10:0] — EEPROM Timebase Prescaler
Reset:
Reset:
Read:
Write:
Read:
Write:
This bit enables/disables the security feature of the EEDIV registers.
When EEDIV security feature is enabled, the state of the registers
EEDIVH and EEDIVL are locked (including this EEDIVSECD bit). The
EEDIVHNVR and EEDIVLNVR non-volatile memory registers are
also protected from being erased/programmed.
These prescaler bits store the value of EEDIV which is used as the
divisor to derive a timebase of 35 s from the selected reference clock
source (CGMXCLK or bus clock, see
for the EEPROM related internal timer and circuits. EEDIV[10:0] bits
are readable at any time. They are writable when EELAT=0 and
EEDIVSECD=1.
Freescale Semiconductor, Inc.
For More Information On This Product,
1 = EEDIV security feature disabled
0 = EEDIV security feature enabled
Figure 5-5. EEPROM Divider Register High (EEDIVH)
EEDIVSECD
Figure 5-6. EEPROM Divider Register Low (EEDIVL)
EEDIV7
$FE1A
$FE1B
Bit 7
Bit 7
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EEDIV6
R
6
6
EEPROM
EEDIV5
R
5
5
Contents of EEDIVHNVR ($FE10)
Contents of EEDIVLNVR ($FE11)
EEDIV4
R
4
4
6.5 Configuration Register
EEDIV3
R
3
3
EEDIV10
EEDIV2
2
2
EEPROM Registers
EEDIV9
EEDIV1
1
1
Technical Data
EEPROM
EEDIV8
EEDIV0
Bit 0
Bit 0
2)
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