HD6432138SW datasheet(653/1061 Pages) RENESAS

653 / 1061 page

Section 21 ROM (Mask ROM Version, H8S/2138 F-ZTAT, H8S/2134 F-ZTAT, and H8S/2132 F-ZTAT)

Rev. 4.00 Jun 06, 2006 page 599 of 1004

REJ09B0301-0400

21.6.2

User Program Mode

When set to user program mode, the chip can program and erase its flash memory by executing a

user program/erase control program. Therefore, on-board reprogramming of the on-chip flash

memory can be carried out by providing on-board supply of programming data, and storing a

program/erase control program in part of the program area as necessary.

To select user program mode, select a mode that enables the on-chip flash memory (mode 2 or 3).

In this mode, on-chip supporting modules other than flash memory operate as they normally

would in mode 2 and 3.

The flash memory itself cannot be read while the SWE bit is set to 1 to perform programming or

erasing, so the control program that performs programming and erasing should be run in on-chip

RAM or external memory.

Figure 21.11 shows the procedure for executing the program/erase control program when

transferred to on-chip RAM.

Branch to flash memory application

program

Branch to program/erase control

program in RAM area

Execute program/erase control

program (flash memory rewriting)

Transfer program/erase control

program to RAM

MD1, MD0 = 10, 11

Reset-start

Write the transfer program (and the program/

erase control program if necessary) beforehand

Note: The watchdog timer should be activated to prevent overprogramming or overerasing

due to program runaway, etc.

Figure 21.11 User Program Mode Execution Procedure

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