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16.6 Starting the Automatic Algorithm
16.6 Starting the Automatic Algorithm
For writing data to or erasing data from flash memory, start the automatic algorithm
stored in flash memory.
■
Command Operation
At the start of the automatic algorithm, one to six half-words (16 bits) are written. This data is
called the command.
If the address and data to be written are invalid or are written in an incorrect sequence, the flash
memory is reset to read mode.
Table 16.6-1 lists the commands of the automatic algorithm.
❍
Read/Reset command
When returning to the read mode after the time limit was exceeded, a Read/Reset command
sequence can be issued. Data is read from the flash memory in the next read cycle.
The flash memory remains in reading state until another command is entered.
When the power is turned on, flash memory is automatically set to the read or reset state. In
Table 16.6-1 Commands
Command
sequence
First write cycle Second write cycle Third write cycle Fourth write or
read cycle
Fifth read cycle Sixth write cycle
Data Data Data Data Data Data
Read/
Reset
1
xxxxxxxxh F0F0h
Read/
Reset
4
AAAAh 5555h F0F0h RA RD
Program
4
AAAAh 5555h
A0A0h
PA
PD
Chip Erase
6
AAAAh 5555h 8080h AAAAh 1010h
Sector
Erase
6
AAAAh 5555h 8080h AAAAh SA 3030h
Temporarily Stop
Sector Erase
B0B0h
Start Sector Erase
3030h
Access
count
xxxxxxxxh
xxxxxxxxh
Address
Address
AddressAddress
Address Address
000D5556h
000D5556h
000D5556h
000D5556h
000EAAAAh
000EAAAAh
000EAAAAh
000EAAAAh
000D5556h
000D5556h
000D5556h
000D5556h
000D5556h
000D5556h
000EAAAAh
000EAAAAh
000D5556h
5555h
5555h
In FR-CPU programming mode, always issue the command in half-word write mode.
RA: read address; RD: read data
PA: write address; PD: write data
SA: sector address (specify one sector address arbitrarily. See Table 16.4-1.)
The Temporarily Stop Sector Erase or Temporarily Stop Erase command (B0H) and the Start Sector Erase
or Restart Erase command (30H) are valid only during a sector erase operation.
Both Reset commands can reset flash memory to the read mode.