S9S08AW16A FREESCALE [Freescale Semiconductor, Inc], S9S08AW16A Datasheet - Page 51

• Manufacturer Part Number: S9S08AW16A
• Description: HCS08 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

4.4.3
The steps for executing any of the commands are listed below. The FCDIV register must be initialized and
any error flags cleared before beginning command execution. The command execution steps are:
A partial command sequence can be aborted manually by writing a 0 to FCBEF any time after the write to
the memory array and before writing the 1 that clears FCBEF and launches the complete command.
Aborting a command in this way sets the FACCERR access error flag which must be cleared before
starting a new command.
A strictly monitored procedure must be obeyed or the command will not be accepted. This minimizes the
possibility of any unintended changes to the FLASH memory contents. The command complete flag
(FCCF) indicates when a command is complete. The command sequence must be completed by clearing
FCBEF to launch the command.
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1. Write a data value to an address in the FLASH array. The address and data information from this
2. Write the command code for the desired command to FCMD. The five valid commands are blank
3. Write a 1 to the FCBEF bit in FSTAT to clear FCBEF and launch the command (including its
write is latched into the FLASH interface. This write is a required first step in any command
sequence. For erase and blank check commands, the value of the data is not important. For page
erase commands, the address may be any address in the 512-byte page of FLASH to be erased. For
mass erase and blank check commands, the address can be any address in the FLASH memory.
Whole pages of 512 bytes are the smallest block of FLASH that may be erased. In the 60K version,
there are two instances where the size of a block that is accessible to the user is less than 512 bytes:
the first page following RAM, and the first page following the high page registers. These pages are
overlapped by the RAM and high page registers respectively.
check (0x05), byte program (0x20), burst program (0x25), page erase (0x40), and mass erase
(0x41). The command code is latched into the command buffer.
address and data information).
Program and Erase Command Execution
Byte program
Byte program (burst)
Page erase
Mass erase
Do not program any byte in the FLASH more than once after a successful
erase operation. Reprogramming bits to a byte which is already
programmed is not allowed without first erasing the page in which the byte
resides or mass erasing the entire FLASH memory. Programming without
first erasing may disturb data stored in the FLASH.
1
Excluding start/end overhead
Parameter
Figure 4-2
Table 4-5. Program and Erase Times
MC9S08AC16 Series Data Sheet, Rev. 8
is a flowchart for executing all of the commands except for
Cycles of FCLK
NOTE
20,000
4000
9
4
Time if FCLK = 200 kHz
100 ms
20 μs
20 ms
45 μs
1
Chapter 4 Memory
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