Renesas R8C/Tiny Series Manuel télécharger pdf (Page 160)

R8C/10 Group

Rev.1.20 Jan 27, 2006 page 150 of 180

REJ09B0019-0120

17.4.3 Software Commands

Software commands are described below. The command code and data must be read and written in

8-bit units.

Table 17.4 Software Commands

• Read Array Command

This command reads the flash memory.

Writing ‘FF16’ in the first bus cycle places the microcomputer in read array mode. Enter the read

address in the next or subsequent bus cycles, and the content of the specified address can be read

in 8-bit units.

Because the microcomputer remains in read array mode until another command is written, the con-

tents of multiple addresses can be read in succession.

• Read Status Register Command

This command reads the status register.

Write ‘7016’ in the first bus cycle, and the status register can be read in the second bus cycle. (Refer

to Section 17.4.4, “Status Register.”) When reading the status register too, specify an address in the

user ROM area.

Avoid executing this command in EW1 mode.

• Clear Status Register Command

This command sets the status register to “0”.

Write ‘5016’ in the first bus cycle, and the FMR06 to FMR07 bits in the FMR0 register and SR4 to SR5

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

Command

Program

Clear status register

Read array

Read status register

First bus cycle Second bus cycle

Block erase

Write

Mode

Read

Write

Mode

Address

SRD

Data

to D

)

Data

to D

)

Address

SRD: Status register data (D

to D

)

WA: Write address (Make sure the address value specified in the the first bus cycle is the same address

as the write address specified in the second bus cycle.)

WD: Write data (8 bits)

BA: Given block address

X: Any address in the user ROM area

17.4 CPU Rewrite Mode

1 2 ... 155 156 157 158 159 160 161 162 163 164 165 ... 198 199

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Renesas R8C/Tiny Series Manuel Page 160

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