M30622M4 MITSUBISHI [Mitsubishi Electric Semiconductor], M30622M4 Datasheet - Page 262

• Manufacturer Part Number: M30622M4
• Description: SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
• Manufacturer: MITSUBISHI [Mitsubishi Electric Semiconductor]

Appendix Standard Serial I/O Mode (Flash Memory Version)
262
Figure 1.31.13. Timing for download
Figure 1.31.12. Timing for disabling the lock bit
Lock Bit Disable Command
Download Command
This command disables the lock bit. The command code “75
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.
This command downloads a program to the RAM for execution. Execute the download command as
explained here following.
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.
(1) Send the “FA
(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
(4) The program to execute is sent in the 5th byte onward.
(M16C reception data)
(M16C transmit data)
in the 5th byte onward.
RTS1(BUSY)
CLK1
RxD1
TxD1
16
” command code in the 1st byte of the transmission.
(M16C reception data)
(M16C transmit data)
RTS1(BUSY)
FA
Data size (low)
16
CLK1
RxD1
TxD1
75
Data size (high)
16
Check
sum
16
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Program
” is sent in the 1st byte of the serial
data
Program
data
Mitsubishi microcomputers
M16C / 62 Group