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Appendix Parallel I/O Mode (Flash Memory Version)

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

1-235

Parallel I/O Mode

The parallel I/O mode inputs and outputs the software commands, addresses and data needed to operate

(read, program, erase, etc.) the internal flash memory. This I/O is parallel.

Use an exclusive programer supporting M16C/62A (flash memory version).

Refer to the instruction manual of each programer maker for the details of use.

User ROM and Boot ROM Areas

In parallel I/O mode, the user ROM and boot ROM areas shown in Figure 1.25.1 can be rewritten. Both

areas of flash memory can be operated on in the same way.

Program and block erase operations can be performed in the user ROM area. The user ROM area and its

blocks are shown in Figure 1.25.1.

The boot ROM area is 8 Kbytes in size. In parallel I/O mode, it is located at addresses 0FE00016 through

0FFFFF16. Make sure program and block erase operations are always performed within this address

range. (Access to any location outside this address range is prohibited.)

In the boot ROM area, an erase block operation is applied to only one 8 Kbyte block. The boot ROM area

has had a standard serial I/O mode control program stored in it when shipped from the Mitsubishi factory.

Therefore, using the device in standard serial input/output mode, you do not need to write to the boot

ROM area.

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