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M30245

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Renesas Electronics 

M30245 Group

Functional Block Operation

Functional Block Operation

The M30245 group contains many functional blocks in a single chip. These blocks include ROM and RAM to

store instructions and data and the central processing unit (CPU) to execute arithmetic/logic operations.

Also included are peripheral blocks such as Timer A, serial I/O, DMAC, CRC calculation circuit, A/D con-

verter, and I/O ports.

Memory

Figure 1.5 is a memory map of the M30245 group. The address space extends the 1M bytes from address

0000016 to FFFFF16. From FFFFF16 down is ROM. For example, in the M30245MC-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 M30245MC-XXXGP, 10K bytes of internal RAM is mapped to the

space from 0040016 to 02BFF16. 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 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.

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, some memory areas are reserved and cannot be used.

For example, in the M30245MC-XXXGP, the following areas cannot be used.

• The space between 02C0016 and 03FFF16 (Memory expansion and microprocessor modes)

• The space between D000016 and E000016 (Memory expansion mode)

0000016

0040016

SFR area

For details, see

Table 1.6 to 1.13

Internal RAM area

XXXXX16

0400016

Internal reserved

area (Note 1)

External area

Type No.

Address XXXXX16

M30245FCGP

02BFF16

M30245MC-XXXGP

02BFF16

M30245M8-XXXGP

017FF16

Address YYYYY16

E000016

E000016

F000016

D000016

YYYYY16

FFFFF16

Internal reserved

area (Note 2)

Internal ROM area

(Note 3)

FFE0016

Special page

vector table

FFFDC16

FFFFF16

Undefined instruction

Overflow

BRK instruction

Address match

Single step

Watchdog timer

DBC

NMI

Reset

Note 1: Cannot be used during memory expansion and microprocessor modes.

Note 2: Cannot be used in memory expansion mode.

Note 3: Write nothing to internal ROM area in masked ROM.

Figure 1.5. Memory map

Rev.2.00 Oct 16, 2006 page 12 of 264

REJ03B0005-0200

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