MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 49

• Manufacturer Part Number: MC68HC705X32CFU
• Manufacturer: Freescale Semiconductor

Specifications of MC68HC705X32CFU

• Cpu Family: HC05
• Device Core Size: 8b
• Frequency (max): 4MHz
• Interface Type: SCI
• Program Memory Type: EPROM
• Program Memory Size: 32KB
• Total Internal Ram Size: 528Byte
• # I/os (max): 32
• Number Of Timers - General Purpose: 1
• Operating Supply Voltage (typ): 5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 4.5V
• On-chip Adc: 8-chx8-bit
• Instruction Set Architecture: CISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 64
• Package Type: PQFP
• Lead Free Status / Rohs Status: Supplier Unconfirmed

(1) This register is implemented in EEPROM; therefore reset has no effect on the individual bits.
If a second word is to be erased, it is important that the E1LAT bit be reset before restarting the
erasing sequence, otherwise any write to a new address will have no effect. This condition provides
a higher degree of security for the stored data.
User programs must be running from the RAM or ROM as the EEPROM will have its address and
data buses latched.
3.5.4
To program a byte of EEPROM, the following steps should be taken:
While a programming operation is being performed, any access of the EEPROM array will not be
successful.
Warning: To program a byte correctly, it has to have been previously erased.
If a second word is to be programmed, it is important that the E1LAT bit be reset before restarting
the programming sequence otherwise any write to a new address will have no effect. This condition
provides a higher degree of security for the stored data.
User programs must be running from the RAM or ROM as the EEPROM will have its address and
data buses latched.
Note:
3.5.5
This register (OPTR), located at $0100, contains the secure and protect functions for the EEPROM
and allows the user to select options in a non-volatile manner. The contents of the OPTR register
are loaded into data latches with each power-on or external reset.
MC68HC05X16
1 Set the E1LAT bit.
2 Write address/data to the EEPROM address to be programmed.
3 Set the E1PGM bit.
4 Wait for time t
5 Reset the E1LAT bit (to logic zero).
Options (OPTR)
224 bytes of EEPROM (address $0120 to $01FF) can be program and erase protected
under the control of bit 1 of the OPTR register detailed in
EEPROM programming operation
Options register (OPTR)
Freescale Semiconductor, Inc.
(1)
For More Information On This Product,
PROG1
Address
Go to: www.freescale.com
$0100
.
MEMORY AND REGISTERS
bit 7
bit 6
bit 5
bit 4
bit 3
Section
bit 2
EE1P
bit 1
3.5.5.
SEC Not affected
bit 0
on reset
State
3-7
3