M16CSLASH62 datasheet(30/615 Pages) RENESAS

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Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Memory

1-11

Operation of Functional Blocks

The M16C/62A 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, D-A converter, DMAC, CRC calculation circuit,

A-D converter, and I/O ports.

The following explains each unit.

Memory

Figure 1.3.1 is a memory map of the M16C/62A group. The address space extends the 1M bytes from

address 0000016 to FFFFF16. From FFFFF16 down is ROM. For example, in the M30622MCA-XXXFP,

there is 128K bytes of internal ROM from E000016 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 M30622MCA-XXXFP, 5K bytes of internal RAM is mapped

to the space from 0040016 to 017FF16. In addition to storing data, the RAM also stores the stack used when

calling subroutines 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. Figures 1.6.1 to 1.6.3 are location

of peripheral unit control registers. 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.

In memory expansion mode and microprocessor mode, a part of the spaces are reserved and cannot be

used. For example, in the M30622MCA-XXXFP, the following spaces cannot be used.

• The space between 0180016 and 03FFF16 (Memory expansion and microprocessor modes)

• The space between D000016 and DFFFF16 (Memory expansion mode)

Figure 1.3.1. Memory map

0000016

YYYYY16

FFFFF16

0040016

0400016

XXXXX16

D000016

External area

Internal ROM area

SFR area

For details, see Figures

1.6.1 to 1.6.3

Internal RAM area

Internal reserved

area (Note 1)

Internal reserved

area (Note 2)

FFE0016

FFFDC16

FFFFF16

Note 1: During memory expansion and microprocessor modes, can not be used.

Note 2: In memory expansion mode, can not be used.

Note 3: These memory maps show an instance in which PM13 is set to 0; but in the

case of products in which the internal RAM and the internal ROM are expanded

to over 15 Kbytes and 192 Kbytes, respectively, they show an instance in which

PM13 is set to 1.

Undefined instruction

Overflow

BRK instruction

Address match

Single step

Watchdog timer

Reset

Special page

vector table

DBC

NMI

Address YYYYY16

3K bytes

00FFF16

053FF16

017FF16

013FF16

Address XXXXX16

ROM size

02BFF16

5K bytes

4K bytes

10K bytes

20K bytes

RAM size

32K bytes

C000016

E800016

F000016

E000016

96K bytes

64K bytes

128K bytes

256K bytes

F800016

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