User’s Manual U11969EJ3V0UM00
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CHAPTER 14 FLASH MEMORY (
µ
PD70F3008 AND 70F3008Y ONLY)
14.6.4 Communication command
The V854 communicates with the dedicated flash writer by means of commands. The command sent from the
dedicated flash writer to the V854 is called a “command”. The response signal sent from the V854 to the dedicated
flash writer is called a “response command”.
The following shows the command for flash memory control of the V854. All of these commands are issued from
the dedicated flash writer, and the V854 performs the various processings corresponding to the commands.
Category
Command Name
Function
Verify
One-shot verify command
Compares the contents of the entire memory
and the input data.
Erase
One-shot erase command
Erases the contents of the entire memory.
Blank check
One-shot blank check command
Checks the erase state of the entire memory.
Data write
High-speed write command
Writes data by the specification of the write
address and the number of bytes to be written,
and executes verify check.
Continuous write command
Writes data from the address following the high-
speed write command executed immediately
before, and executes verify check.
System setting and control
Status read out command
Acquires the status of operations.
Oscillating frequency setting command
Sets the oscillating frequency.
Erasing time setting command
Sets the erasing time of one-shot erase.
Writing time setting command
Sets the writing time of data write.
Baud rate setting command
Sets the baud rate when using UART.
Silicon signature command
Reads outs the silicon signature information.
Reset command
Escapes from each state.
The V854 sends back response commands to the commands issued from the dedicated flash writer. The following
shows the response commands the V854 sends out.
Response Command Name
Function
ACK (acknowledge)
Acknowledges command/data, etc.
NAK (not acknowledge)
Acknowledges illegal command/data, etc.
14.6.5 Resources used
According to the flash memory programming mode setting, the resources used consist of the area from FFE000H
to FFE7FFH of the internal RAM and all the registers. Area FFE800H to FFEFFFH of the internal RAM retains data
as long as the power is on. The contents of the registers that are initialized by reset change to the default value.
Dedicated flash writer
V854
Command
Response command
Содержание V854 UPD703006
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