3886 datasheet(112/380 Pages) RENESAS

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3886 Group User’s Manual

HARDWARE

q Program command

When “4016” is written to the flash command register, the

M38869FFAHP/GP enters the program mode.

Subsequently to this, if the instruction (for instance, STA

instruction) for writing byte data in the address to be programmed

is executed, the control circuit of the flash memory executes the

program. The erase/program busy flag of the flash memory control

when the program is completed. Accordingly, after the write in-

struction is executed, CPU can recognize the completion of the

program by polling this bit.

The programmed area must be specified beforehand by the erase/

program area select bits.

During programming, watchdog timer stops with “FFFF16” set.

Note: A programming operation is not completed by executing the

program command once. Always be sure to execute a pro-

gram verify command after executing the program command.

When the failure is found in this verification, the user must re-

peatedly execute the program command until the pass. Refer

to Figure 84 for the flow chart of the programming.

q Program verify command

When “C016” is written to the flash command register, the

M38869FFAHP/GP enters the program verify mode. Subsequently

to this, if the instruction (for instance, LDA instruction) for reading

byte data from the address to be verified (i.e., previously pro-

grammed address), the contents which has been written to the

address actually is read.

CPU compares this read data with data which has been written by

the previous program command. In consequence of the compari-

son, if not agreeing, the operation of “program

→ program verify”

must be executed again.

q Erase command

When writing “2016” twice continuously to the flash command reg-

ister, the flash memory control circuit performs erase to the area

specified beforehand by the erase/program area select bits.

Erase/program busy flag of the flash memory control register be-

comes “1” when erase begins, and it becomes “0” when erase

completes. Accordingly, CPU can recognize the completion of

erase by polling this bit.

Data “0016” must be written to all areas to be erased by the pro-

gram and the program verify commands before the erase

command is executed.

During erasing, watchdog timer stops with “FFFF16” set.

Note: The erasing operation is not completed by executing the erase

command once. Always be sure to execute an erase verify

command after executing the erase command. When the fail-

ure is found in this verification, the user must repeatedly ex-

ecute the erase command until the pass. Refer to Figure 84 for

the erasing flowchart.

q Erase verify command

When “A016” is written to the flash command register, the

M38869FFAHP/GP enters the erase verify mode. Subsequently to

this, if the instruction (for instance, LDA instruction) for reading

byte data from the address to be verified, the contents of the ad-

dress is read.

CPU must erase and verify to all erased areas in a unit of ad-

dress.

If the address of which data is not “FF16” (i.e., data is not erased)

is found, it is necessary to discontinue erasure verification there,

and execute the operation of “erase

→ erase verify” again.

Note: By executing the operation of “erase

→ erase verify” again

when the memory not erased is found. It is unnecessary to

write data “0016” before erasing in this case.

q Reset command

The reset command is a command to discontinue the program or

erase command on the way. When “FF16” is written to the command

flash command register, the program, or erase command becomes

invalid (reset), and the M38869FFAHP/GP enters the reset mode.

The contents of the memory does not change even if the reset com-

mand is executed.

DC Electric Characteristics

Note: The characteristic concerning the flash memory part are the

same as the characteristic of the parallel I/O mode.

AC Electric Characteristics

Note: The characteristics are the same as the characteristic of the

microcomputer mode.

FUNCTIONAL DESCRIPTION

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