7480 datasheet(39/337 Pages) RENESAS

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7480 Group and 7481 Group User's Manual

1-22

HARDWARE

1.9 Memory Maps

Figure 1.9.1 shows the memory maps of the 7480 Group and 7481 Group.

Memories and I/Os located in the access area are described below.

RAM

The internal RAM is located in the area listed in Table 1.9.1. Internal RAM is used for data storage,

the stack area used subroutine call or interrupt generation.

To prevent the contents of RAM from being destroyed, take the depth of subroutine nesting and the

level of interrupt into consideration when using RAM as the stack area.

Special Function Registers (SFR) (Addresses ‘00C016’ through ‘00FF16’)

Special function registers (SFR) are assigned to addresses ‘00C016’ through ‘00FF16’. Various control

registers for the I/O ports, the timers, the serial I/O, the A-D converter, and the interrupts are located

in the SFR area.

Figure 1.9.2 shows the memory map of the SFR area.

ROM

The internal ROM is located in the area listed in Table 1.9.2. Internal ROM is used to store data

tables and programs. In the 7480 Group and 7481 Group, addresses ‘FFE416’ through ‘FFFF16’ of

the ROM area are assigned to the vector area where the jump addresses after system is released

from reset and interrupt generation are stored.

Figure 1.9.3 shows the memory map of the interrupt vector area.

Table 1.9.1 RAM Area

Product

M3748xM2

M3748xM4

M3748xM8/E8

Range of RAM Area

Addresses ‘000016’ through ‘007F16’

Addresses ‘000016’ through ‘00BF16’, Addresses ‘010016’ through ‘013F16’

Addresses ‘000016’ through ‘00BF16’, Addresses ‘010016’ through ‘01FF16’

RAM Size

128

× 8 bits

256

× 8 bits

448

× 8 bits

Table 1.9.2 ROM Area

Product

M3748xM2

M3748xM4

M3748xM8

M3748xE8

Range of ROM Area

Addresses ‘F00016’ through ‘FFFF16’

Addresses ‘E00016’ through ‘FFFF16’

Addresses ‘C00016’ through ‘FFFF16’

ROM Size

× 8 bits

16K

× 8 bits

1.9 Memory Maps

Memory Type

Mask ROM

PROM

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