M16CSLASH62M datasheet(237/615 Pages) RENESAS

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Description (Flash Memory Version)

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

1-218

Flash Memory

The M16C/62A (flash memory version) contains the flash memory that can be rewritten with a single volt-

age. For this flash memory, three flash memory modes are available in which to read, program, and erase:

parallel I/O and standard serial I/O modes in which the flash memory can be manipulated using a program-

mer and a CPU rewrite mode in which the flash memory can be manipulated by the Central Processing Unit

(CPU). Each mode is detailed in the pages to follow.

The flash memory is divided into several blocks as shown in Figure 1.25.1, so that memory can be erased

one block at a time. Each block has a lock bit to enable or disable execution of an erase or program

operation, allowing for data in each block to be protected.

In addition to the ordinary user ROM area to store a microcomputer operation control program, the flash

memory has a boot ROM area that is used to store a program to control rewriting in CPU rewrite and

standard serial I/O modes. This boot ROM area has had a standard serial I/O mode control program stored

in it when shipped from the factory. However, the user can write a rewrite control program in this area that

suits the user’s application system. This boot ROM area can be rewritten in only parallel I/O mode.

Figure 1.25.1. Block diagram of flash memory version

0C000016

0D000016

Block 6 : 64K byte

Block 5 : 64K byte

0E000016

Block 4 : 64K byte

0F000016

Block 3 : 32K byte

0F800016

Block 2 : 8K byte

0FA00016

Block 1 : 8K byte

Block 0 : 16K byte

0FC00016

User ROM area

8K byte

0FE00016

0FFFFF16

Boot ROM area

Flash memory

size

Flash memory

start address

256Kbytes

0C000016

128Kbytes

0E000016

Note 1: The boot ROM area can be rewritten in

only parallel input/output mode. (Access

to any other areas is inhibited.)

Note 2: To specify a block, use the maximum

address in the block that is an even

address.

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