M16CSLASH62 datasheet(278/621 Pages) RENESAS

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Appendix Standard Serial I/O Mode (Flash Memory Version)

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

263

Lock Bit Disable Command

This command disables the lock bit. The command code “7516” is sent in the 1st byte of the serial

transmission. This command only disables the lock bit function; it does not set the lock bit itself.

However, if an erase command is executed after executing the lock bit disable command, “0” (locked)

lock bit data is set to “1” (unlocked) after the erase operation ends. In any case, after the reset is

cancelled, the lock bit is enabled.

7516

CLK1

RxD1

TxD1

RTS1(BUSY)

(M16C reception data)

(M16C transmit data)

FA16

Program

data

Program

data

Data size (high)

Data size (low)

Check

sum

CLK1

RxD1

TxD1

RTS1(BUSY)

(M16C reception data)

(M16C transmit data)

Figure 1.31.13. Timing for download

Download Command

This command downloads a program to the RAM for execution. Execute the download command as

explained here following.

(1) Send the “FA16” command code in the 1st byte of the transmission.

(2) Send the program size in the 2nd and 3rd bytes of the transmission.

(3) Send the check sum in the 4th byte of the transmission. The check sum is added to all data sent

in the 5th byte onward.

(4) The program to execute is sent in the 5th byte onward.

When all data has been transmitted, if the check sum matches, the downloaded program is executed.

The size of the program will vary according to the internal RAM.

Figure 1.31.12. Timing for disabling the lock bit

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