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M30802SC

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

MITSUBISHI ELECTRIC  

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Preliminary Specifications REV.B

Mitsubishi microcomputers

Specifications in this manual are tentative and subject to change. M16C/80 (144-pin version) group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Operation of Functional Blocks

The M16C/80 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, DRAM controller and I/O ports.

The following explains each unit.

Memory

Figure 1.2.1 is a memory map of the M16C/80 group. The address space extends the 16 Mbytes from

address 00000016 to FFFFFF16. From FFFFFF16 down is ROM. For example, in the M30802MC-XXXGP,

there is 128K bytes of internal ROM from FE000016 to FFFFFF16. The vector table for fixed interrupts such

_______

as the reset and NMI are mapped to FFFFDC16 to FFFFFF16. 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 00040016 up is RAM. For example, in the M30802MC-XXXGP, 10 Kbytes of internal RAM is mapped

to the space from 00040016 to 002BFF16. 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 00000016 to 0003FF16. This area accommodates the control registers for

peripheral devices such as I/O ports, A-D converter, serial I/O, and timers, etc. Figure 1.5.1 to 1.5.4 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 FFFE0016 to FFFFDB16. If the starting addresses of subrou-

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

tions 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 M30802MC-XXXGP, the following spaces cannot be used.

• The space between 002C0016 and 00800016 (Memory expansion and microprocessor modes)

• The space between F0000016 and FDFFFF16 (Memory expansion mode)

00000016

00040016

XXXXXX16

00800016

SFR area

For details, see

Figures 1.5.1 to

1.5.4

Internal RAM

area

Internal reserved

area (Note 1)

FFFE0016

Special page

vector table

External area

Type No.

M30802MC/FC

M30805MG/FG

M30802S

M30805S

Address

XXXXX16

002BFF16

0053FF16

002BFF16

0063FF16

Address

YYYYY16

FE000016

FC000016

F0000016

YYYYYY16

FFFFFF16

Internal reserved

area (Note 2)

Internal ROM

area

FFFFDC16

Undefined instruction

Overflow

BRK instruction

Address match

Watchdog timer

FFFFFF16

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 1.2.1. Memory map

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