M16C80 Datasheet, PDF (284/358 Pages) Renesas Technology Corp – RENESAS 16-BIT SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/80 SERIES

M16C/80 Group
29. Flash Memory Version
Flash Memory
The M16C/80 (flash memory version) contains the flash memory that can be rewritten with a single voltage
of 5 V. 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
programmer and a CPU rewrite mode in which the flash memory can be manipulated by the Central Pro-
cessing Unit (CPU). Each mode is detailed in the pages to follow.
The flash memory is divided into several blocks as shown in Figure 29.3, 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.
0FC000016
Block 6 : 64K byte
0FD000016
Block 5 : 64K byte
0FE000016
Block 4 : 64K byte
0FF000016
Block 3 : 32K byte
0FF800016
0FFA00016
0FFC00016
0FFFFFF16
Block 2 : 8K byte
Block 1 : 8K byte
Block 0 : 16K byte
User ROM area
Flash memory
size
128Kbytes
Flash memory
start address
0FE000016
256Kbytes
0FC000016
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.
0FFE00016
0FFFFFF16
8K byte
Boot ROM area
Figure 29.3 Block diagram of flash memory version
Rev.1.00 Aug. 02, 2005 ^{Page 273} of 329
REJ09B0187-0100