R8C datasheet(161/199 Pages) RENESAS

161 / 199 page

R8C/10 Group

Rev.1.20 Jan 27, 2006

page 151 of 180

REJ09B0019-0120

Start

Program

completed

YES

Write the command code ‘4016’ to

the write address

Write data to the write address

FMR00=1?

Full status check

Figure 17.9 Program Flow Chart

• Program

This command writes data to the flash memory in one byte units.

Write ‘4016’ in the first bus cycle and write data to the write address in the second bus cycle, and an

auto program operation (data program and verify) will start. Make sure the address value specified in

the first bus cycle is the same address as the write address specified in the second bus cycle.

Check the FMR00 bit in the FMR0 register to see if auto programming has finished. The FMR00 bit

is “0” during auto programming and set to “1” when auto programming is completed.

Check the FMR06 bit in the FMR0 register after auto programming has finished, and the result of

auto programming can be known. (Refer to Section 17.4.5, “Full Status Check.”)

Writing over already programmed addresses is inhibited.

When the FMR02 bit in the FMR0 register is set to “0” (rewrite disabled), the Program command on

the Block0 and Block1 is not accepted.

In EW1 mode, do not execute this command on any address at which the rewrite control program is

located.

In EW0 mode, the microcomputer goes to read status register mode at the same time auto program-

ming starts, making it possible to read the status register. The status register bit 7 (SR7) is set to “0”

at the same time auto programming starts, and set back to “1” when auto programming finishes. In

this case, the microcomputer remains in read status register mode until a read array command is

written next. The result of auto programming can be known by reading the status register after auto

programming has finished.

17.4 CPU Rewrite Mode

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