M16CSLASH1N datasheet(21/238 Pages) RENESAS

21 / 238 page

Rev.1.00

Oct 20, 2004

page 9 of 222

M16C/1N Group

3. Memory

REJ09B0007-0100Z

3. Memory

Figure 3.1 is a memory map. The address space extends the 1M bytes from address 0000016 to FFFFF16.

From FFFFF16 down is ROM. For example, in the M301N2M4T-XXXFP, there is 32K bytes of internal ROM

from F800016 to FFFFF16. The vector table for fixed interrupts such as the reset 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 M301N2M4T-XXXFP, there is 1K byte of internal RAM from

0040016 to 007FF16. In addition to storing data, the RAM also stores the stack used when calling subrou-

tines and when interrupts are generated.

The SFR area is mapped to 0000016 to 003FF16. This area accommodates the control registers for periph-

eral 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.

The special page vector table is mapped to FFE0016 to FFFDB16. If the starting addresses of subroutines

or the destination addresses of jumps are stored here, subroutine call instructions and jump instructions

can be used as 2-byte instructions, reducing the number of program steps.

Figure 3.1 Memory map

Special page

vector table

Undefined instruction

Overflow

BRK instruction

Address match

Single step

Watchdog timer

DBC

UART0 reception

Reset

FFE0016

FFFDC16

FFFFF16

SFR area

(For details, refer to

4. SFR)

Internal RAM area

Internal ROM area

0000016

0040016

XXXXX16

YYYYY16

FFFFF16

Type No.

Internal RAM

Internal ROM

Size

Address YYYYY16

Size

Address XXXXX16

M301N2M4T

M301N2M8T

M301N2F8TFP

M301N2F8FP

32 Kbytes

64 Kbytes

F800016

F000016

1 Kbytes

3 Kbytes

007FF16

00FFF16

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