M16C26 Datasheet, PDF (14/239 Pages) Renesas Technology Corp – 16-BIT CMOS SINGLE-CHIP MICROCOMPUTER M16C FAMILY / M16C/20 SERIES

Udenvdeelropment
Preliminary Specifications Rev. 0.9
Specifications in this manual are tentative and subject to change.
Memory
M16C/26 Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Functional Block Operation
The M16C/26 group accommodates certain units in a single chip. These units include ROM and
RAM to store instructions and data and the central processing unit (CPU) to execute arithmetic/
logic operations. Also included are peripheral units such as timers, serial I/O, A-D converter, and
I/O ports.
Memory
Figure 1.4.1 is a memory map of the M16C/26 group. The linear address space of 1M bytes extends
from address 0000016 to FFFFF16. From FFFFF16 down is ROM. For example, in the M30262F4, there
is 32K bytes of internal ROM from F800016 to FFFFF16. The vector table for fixed interrupts such as the
reset and NMI are mapped to FFFDC16 to FFFFF16. The starting address of the interrupt routine is
stored here. The address of the vector table for timer interrupts, etc., can be set as desired using the
internal register (INTB). See the section on interrupts for details.
From 0040016 up is RAM. For example, in the M30262F4, 1K bytes of internal RAM is mapped to the
space from 0040016 to 07FF16. In addition to storing data, the RAM also stores the stack used when
calling subroutines and when interrupts are generated.
These devices also contain two blocks of Flash ROM as Virtual EEPROM memory to store data. These
2 blocks of 2K bytes are located from 0F00016 to 0FFFF16 on all versions.
The SFR area is mapped from 0000016 to 003FF16. This area accommodates the control registers for
peripheral devices such as I/O ports, A-D converter, serial I/O, and timers, etc. Any part of the SFR
area that is not occupied is reserved and cannot be used for other purposes.
00000₁₆
00400₁₆
SFR area
Type No.
M 30262F3G P
M 30262F4G P
M 30262F6G P
M 30262F8G P
Address XXXXX₁₆
0 0 7 F F ₁₆
0 0 7 F F ₁₆
0 0 B F F ₁₆
0 0 B F F ₁₆
Address Y Y Y Y Y ₁₆
FA 000₁₆
F 8 0 0 0 ₁₆
F 4 0 0 0 ₁₆
F 0 0 0 0 ₁₆
XXXXX₁₆
0F000₁₆
0F800₁₆
10000₁₆
Internal RAM area
RESERVED
Virtual EEPROM
Virtual EEPROM
RESERVED
YYYYY₁₆
Flash ROM
FFFFF₁₆
Figure 1.4.1. Memory map
FFE00₁₆
Special Page
Vector Table
FFFDC₁₆
FFFFF₁₆
Undefined Instruction
Overflow
Break Instruction
Address Match
Single Step
Watchdog Timer
DBC
NMI
Reset
Hardware
Vectors
8
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