MC908AZ60ACFU Freescale Semiconductor, MC908AZ60ACFU Datasheet - Page 89

• Manufacturer Part Number: MC908AZ60ACFU
• Description: IC MCU FLASH 8.4MHZ 60K 64QFP
• Manufacturer: Freescale Semiconductor
• Series: HC08r

Specifications of MC908AZ60ACFU

• Core Processor: HC08
• Core Size: 8-Bit
• Speed: 8.4MHz
• Connectivity: CAN, SCI, SPI
• Peripherals: LVD, POR, PWM
• Number Of I /o: 52
• Program Memory Size: 60KB (60K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 4.5 V ~ 5.5 V
• Data Converters: A/D 15x8b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

7.4.5 EEPROM-2 Programming and Erasing
The unprogrammed or erase state of an EEPROM bit is a logic 1. The factory default for all bytes within
the EEPROM-2 array is $FF.
The programming operation changes an EEPROM bit from logic 1 to logic 0 (programming cannot change
a bit from logic 0 to a logic 1). In a single programming operation, the minimum EEPROM programming
size is one bit; the maximum is eight bits (one byte).
The erase operation changes an EEPROM bit from logic 0 to logic 1. In a single erase operation, the
minimum EEPROM erase size is one byte; the maximum is the entire EEPROM-2 array.
The EEPROM can be programmed such that one or multiple bits are programmed (written to a logic 0) at
a time. However, the user may never program the same bit location more than once before erasing the
entire byte. In other words, the user is not allowed to program a logic 0 to a bit that is already programmed
(bit state is already logic 0).
For some applications it might be advantageous to track more than 10K events with a single byte of
EEPROM by programming one bit at a time. For that purpose, a special selective bit programming
technique is available. An example of this technique is illustrated in
When this technique is utilized, a program/erase cycle is defined as multiple program sequences (up to
eight) to a unique location followed by a single erase operation.
7.4.5.1 Program/Erase Using AUTO Bit
An additional feature available for EEPROM-2 program and erase operations is the AUTO mode. When
enabled, AUTO mode will activate an internal timer that will automatically terminate the program/erase
cycle and clear the EEPGM bit. Please see
Erasing, and
Freescale Semiconductor
Original state of byte (erased)
First event is recorded by programming bit position 0
Second event is recorded by programming bit position 1
Third event is recorded by programming bit position 2
Fourth event is recorded by programming bit position 3
Events five through eight are recorded in a similar fashion
7.5.1 EEPROM-2 Control Register
None of the bit locations are actually programmed more than once although
the byte was programmed eight times.
MC68HC908AZ60A • MC68HC908AS60A • MC68HC908AS60E Data Sheet, Rev. 6
Table 7-2. Example Selective Bit Programming Description
Description
7.4.5.2 EEPROM-2
for more information.
NOTE
Programming,
Program Data
Table
1111:1110
1111:1101
1111:1011
1111:0111
in Binary
n/a
7-2.
7.4.5.3 EEPROM-2
1111:1111
1111:1110
1111:1100
1111:1000
1111:0000
Functional Description
in Binary
Result
89