MC908AZ32ACFU Freescale Semiconductor, MC908AZ32ACFU Datasheet - Page 54

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MC908AZ32ACFU

Manufacturer Part Number
MC908AZ32ACFU
Description
IC MCU 32K FLASH 8.4MHZ 64-QFP
Manufacturer
Freescale Semiconductor
Series
HC08r
Datasheet

Specifications of MC908AZ32ACFU

Core Processor
HC08
Core Size
8-Bit
Speed
8MHz
Connectivity
CAN, SCI, SPI
Peripherals
LVD, POR, PWM
Number Of I /o
40
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 15x8b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-QFP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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EEPROM
5.4.5 EEPROM 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 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 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
Note that none of the bit locations are actually programmed more than once although the byte was
programmed eight times.
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.
5.4.5.1 Program/Erase Using AUTO Bit
An additional feature available for EEPROM 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
5.5.1 EEPROM Control Register
54
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
Table 5-2. Example Selective Bit Programming Description
Description
for more information.
MC68HC908AZ32A Data Sheet, Rev. 2
5.4.5 EEPROM Programming and Erasing
Program Data
Table
1111:1110
1111:1101
1111:1011
1111:0111
in Binary
n/a
5-2.
Freescale Semiconductor
1111:1111
1111:1110
1111:1100
1111:1000
1111:0000
in Binary
Result
and

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