M32CSLASH86 datasheet(430/505 Pages) RENESAS

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Page 407

25. Flash Memory Version

)

(

25.3.5.4 Program Command

The program command writes 1-word, or 2-byte, data to the flash memory.

Auto program operation (data program and verify) will start by writing command code "xx4016" in the

first bus cycle and data to the write address in the second bus cycle. The address value specified in

the first bus cycle must be the same even address as the write address specified in the second bus

cycle.

The FMR00 bit in the FMR0 register indicates whether or not an auto program operation has been

completed. The FMR00 bit is set to "0" (busy) during auto program and to "1" (ready) when the auto

program operation is completed.

After the completion of auto program operation, the FMR06 bit in the FMR0 register indicates whether

or not the auto program operation has been completed as expected. (Refer to 25.3.8 Full Status

Check.)

An address that is already written cannot be altered or rewritten.

Figure 25.9 shows a flow chart of the program command programming.

The lock bit can protect each block from being programmed inadvertently. (Refer to 25.3.6 Data Protect

Function.)

In EW mode 1, do not execute this command on the block where the rewrite control program is allocated.

In EW mode 0, the microcomputer enters read status register mode as soon as an auto program

operation starts. The SRD register can be read. The SR7 bit in the SRD register is set to "0" at the

same time an auto program operation starts. It is set to "1" when an auto program operation is

completed. The microcomputer remains in read status register mode until the read array command is

written. After completion of an auto program operation, the SRD register indicates whether or not the

auto program operation has been completed as expected.

NOTES:

1. Write the command code and data to even addresses.

Start

Program operation

is completed

YES

Write the command code "xx4016"

to an address to be written

Write data to an

address to be written

FMR00=1?

Full status check

Figure 25.9 Program Command

M32C/86 Datasheet(PDF) 430 Page - Renesas Technology Corp