ML22Q533 datasheet(46/178 Pages) ROHM

46 / 178 page

FEDL22Q53X-02

ML22Q53X

● Flash memory rewrite function

The flash memory can be rewritten in the following two ways.

①

Rewrite using the clock synchronous serial interface of the MCU command interface

By using the CSB, SCK, SI and SO pins, which are clock synchronous serial interfaces of the MCU command interface

the flash memory can be rewritten. When the PUP command and FDIRECT command are entered with the IRON pin set to

"L", direct access to the flash memory is enabled from the CSB, SCK, SI and SO pins.

When returning to the normal mode, insert a reset to initialize (RESETB pin is “L” level.) or shut off the power.

For the PUP command, refer to the "PUP command" in the "Command" section. For the FDIRECT command, refer to the

"FDIRECT command" in the "Command" section.

②

Rewrite using flash memory interface

The flash memory can be rewritten using the IRON, IRCSB, IRSCK, IRSI and IRSO pins that is the flash memory interface.

When the PUP command and FDIRECT command are entered with the IRON pin set to "H", direct access to the flash

memory is enabled from the IRCSB, IRSCK, IRSI and IRSO pins.

When returning to the normal mode, insert a reset to initialize (RESETB pin is “L” level.) or shut off the power.

For the PUP command, refer to the "PUP command" in the "Command" section. For the FDIRECT command, refer to the

"FDIRECTcommand" in the "Command" section.

The Chip Erase, Status Read, Program and Read of the flash memory are described on the next page.

IRCSB

Status

IRSCK

IRSI

FDIRECT command

st byte

CBUSYB

tCB1

FDIRECT command

nd byte

tCB1

Flash memory access mode

tPUP

PUP command

IRON

Normal mode

Direct access to the flash memory

is enabled

CSB

Status

SCK

FDIRECT command

st byte

CBUSYB

tCB1

FDIRECT command

nd byte

Flash memory access mode

tPUP

PUP command

IRON

“L”

Direct access to the flash memory

is enabled

tCB1

Normal mode

IRON

IRCSB

IRSCK

IRSI

IRSO

CSB

SCK

SOUND LSI

①CPU command

interface

②Flash・memory

interface

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