MC68HC705X32CFU Freescale Semiconductor, MC68HC705X32CFU Datasheet - Page 48

• 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

3
3.5.2
To be able to read from EEPROM, the E1LAT bit has to be at logic zero, as shown in
While this bit is at logic zero, the E1PGM bit and the E1ERA bit are permanently reset to zero and
the 256 bytes of EEPROM may be read as if it were a normal ROM area. The internal charge pump
generator is automatically switched off since the E1PGM bit is reset.
If a read operation is executed while the E1LAT bit is set (erase or programming sequence), data
resulting from the operation will be $FF.
Note:
3.5.3
To erase the contents of a byte of the EEPROM, the following steps should be taken:
While an erase operation is being performed, any access of the EEPROM array will not be
successful.
The erased state of the EEPROM is $FF and the programmed state is $00.
Note:
1 Set the E1LAT bit.
2 Set the E1ERA bit (1& 2 may be done simultaneously with the same
3 Write address/data to the EEPROM address to be erased.
4 Set the E1PGM bit.
5 Wait for a time t
6 Reset the E1LAT bit (to logic zero).
When not performing any programming or erase operation, it is recommended that
EEPROM should remain in the read mode (E1LAT = 0)
instruction).
Data written to the address to be erased is not used, therefore its value is not significant.
EEPROM read operation
EEPROM erase operation
E1ERA
Freescale Semiconductor, Inc.
0
0
0
1
1
For More Information On This Product,
Table 3-1 EEPROM control bits description
ERA1
E1LAT E1PGM
0
1
1
1
1
.
MEMORY AND REGISTERS
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0
0
1
0
1
Read condition
Ready to load address/data for program/erase
Byte programming in progress
Ready for byte erase (load address)
Byte erase in progress
Description
MC68HC05X16
Table
Rev. 1
3-1.