M16C30M8 View Datasheet(PDF) - Renesas Electronics

Part Name

Description

Manufacturer

M16C30M8

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Renesas Electronics 

Memory

Mitsubishi microcomputers

M16C / 30L Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Operation of Functional Blocks

The M16C/30L 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, DMAC, A-D converter, and I/O ports.

The following explains each unit.

Memory

Figure 1.3.1 is a memory map of the M16C/30L group. The address space extends the 1M bytes from

address 0000016 to FFFFF16. From FFFFF16 down is ROM. For example, in the M30302MCL-XXXGP,

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 M30302MCL-XXXGP, 3K bytes of internal RAM is mapped

to the space from 0040016 to 00FFF16. 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 M30302MCL-XXXGP, 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)

RAM size

2K bytes

3K bytes

Address XXXXX16

00BFF16

00FFF16

ROM size Address YYYYY16

64K bytes

F000016

96K bytes

E800016

128K bytes

E000016

0000016

SFR area

For details, see Figures

1.6.1 to 1.6.3

0040016

XXXXX16

0400016

Internal RAM area

Internal reserved

area (Note 1)

External area

D000016

YYYYY16

Internal reserved

area (Note 2)

Internal ROM area

FFFFF16

FFE0016

Special page

vector table

FFFDC16

FFFFF16

Undefined instruction

Overflow

BRK instruction

Address match

Single step

Watchdog timer

DBC

NMI

Reset

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

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

Figure 1.3.1. Memory map

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