AN2156 Freescale Semiconductor / Motorola, AN2156 Datasheet - Page 77

• Manufacturer Part Number: AN2156
• Description: Programming and Erasing FLASH and EEPROM Memories on the MC68HC908AS60A/AZ60A
• Manufacturer: Freescale Semiconductor / Motorola

EEPROM AUTO Mode Source Code Flowcharts
AN2156
MOTOROLA
The main routine AutoEEPROM.mrt initializes the device for erasing
and programming operations. It sets up the clock source and timebase
divider for the EEPROM memory and specifies the value and the
location to be programmed. The routine then performs the EEPROM
erase and program operations by calling AUTOroutine twice.
The AUTOroutine subroutine follow the flowcharts shown in
and
subroutine which is used to set or clear various bits in the EExCR
registers.
The flowcharts for AutoEEPROM.mrt, AUTOroutine.mrt, and
WriteEECR are
Freescale Semiconductor, Inc.
Note:
If proper values have been programmed to EExDIVHNVR
and EExDIVLNVR, this step is not necessary.
Figure 14
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AND TIMEBASE DIVIDER: CONFIG2,
STORE ONE BYTE DATA TO RAM
ADDRESS INTO EEPROM_addr
SET EEPROM CLOCK SOURCE
EExDIVH, EExDIVL (See Note)
LOAD SELECTED EEPROM
AutoEEPROM.mrt
Figure 25. EEPROM AUTO Mode Main Routine
DISABLE COP
DATA BUFFER
ENABLE LVI
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closely. Flowcharts are also included for the WriteEECR
Figure
25,
Figure
EEPROM AUTO Mode Source Code Flowcharts
26, and
LOAD byteerase, blockerase, OR bulkerase
Figure
LOAD byteprogram TO ACCUMULATOR
TO PROGRAM EEPROM
CALL AUTOroutine TO
TO ACCUMULATOR
CALL AUTOroutine
ERASE EEPROM
27, respectively.
END
Application Note
Figure 13
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