R8CSLASH15 datasheet(217/277 Pages) RENESAS

217 / 277 page

R8C/14 Group, R8C/15 Group

18. Flash Memory Version

Rev.2.10

Jan 19, 2006

Page 205 of 253

REJ09B0164-0210

18.4.3

Software Commands

Software commands are described below. Read or write commands and data from or to in 8-bit units.

SRD: Status register

data (D7 to D0)

WA: Write address (Ensure the address specified in the first bus cycle is the same address as the

address specified in the second bus cycle.)

WD: Write data (8 bits)

BA: Given block address

×:

Any specified address in the user ROM area

18.4.3.1

Read Array Command

The read array command reads the flash memory.

The microcomputer enters read array mode by writing “FFh” in the first bus cycle. If entering the read

address after the following bus cycles, the content of the specified address can be read in 8-bit units.

Since the microcomputer remains in read array mode until another command is written, the contents

of multiple addresses can be read continuously.

18.4.3.2

Read Status Register Command

The read status register command reads the status register.

If writing “70h” in the first bus cycle, the status register can be read in the second bus cycle. (Refer to

18.4.4 Status Register

) When reading the status register, specify an address in the user ROM area.

Do not execute this command in EW1 mode.

18.4.3.3

Clear Status Register Command

The clear status register command sets the status register to “0”.

If writing “50h” in the first bus cycle, the FMR06 to FMR07 bits in the FMR0 register and SR4 to SR5

in the status register will be set to “0”.

Table 18.4

Software Commands

Command

First Bus Cycle

Second Bus Cycle

Mode

Address

Data

(D7 to D0)

Mode

Address

Data

(

D7 to D0)

Read Array

Write

FFh

Read Status Register

Write

70h

Read

SRD

Clear Status Register

Write

50h

Program

Write

40h

Write

Block Erase

Write

20h

Write

D0h

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