M16CSLASH29 datasheet(371/499 Pages) RENESAS

371 / 499 page

20. Flash Memory Version

page 347

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

xxD016

Data

(D15 to D0)

xxFF16

xx7016

xx5016

xx4016

xx2016

Data

(D15 to D0)

Address

SRD: Status register data (D7 to D0)

WA : Write address (However,even address)

WD : Write data (16 bits)

BA : Highest-order block address (However,even address)

X : Any even address in the user ROM area

xx : 8 high-order bits of command code (ignored)

20.7 Software Commands

Read or write 16-bit commands and data from or to even addresses in the user ROM area. When writing a

command code, 8 high-order bits (D15–D8) are ignored.

Table 20.5 Software Commands

20.7.1 Read Array Command (FF16)

The read array command reads the flash memory.

Read array mode is entered by writing command code xxFF16 in the first bus cycle. Content of a speci-

fied address can be read in 16-bit unit after the next bus cycle. The MCU remains in read array mode until

an another command is written. Therefore, contents of multiple addresses can be read consecutively.

20.7.2 Read Status Register Command (7016)

The read status register command reads the status register.

By writing command code xx7016 in the first bus cycle, the status register can be read in the second bus

cycle (Refer to 20.8 Status Register). Read an even address in the user ROM area. Do not execute this

command in EW mode 1.

20.7.3 Clear Status Register Command (5016)

The clear status register command clears the status register to 0.

By writing xx5016 in the first bus cycle, and bits FMR06 to FMR07 in the FMR0 register and bits SR4 to

SR5 in the status register are set to 0.

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