7477 datasheet(47/354 Pages) RENESAS

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HARDWARE

1.9 Memory allocation

7470/7471/7477/7478 GROUP USER’S MANUAL

1-30

1.9 Memory allocation

Figure 1.9.1 and Figure 1.9.2 show the memory allocation of 7470/7471/7477/7478 group.

The memories, I/Os and others located in the access area are explained below.

q RAM

An internal RAM is located in each area shown in Table 1.9.1. The internal RAM is used as a data

storage area and a stack area for subroutine call and interrupt occurrence.

When the RAM is used as a stack area, be careful about subroutine nesting depth and interrupt levels

so that the data in the RAM is not destroyed.

q Special function register (SFR) (Addresses 00C016 to 00FF16)

The area from addresses 00C0 16 to 00FF16 is assigned to the SFR (Special Function Register).

Various control registers such as I/O ports, timers, serial I/Os, A-D converters and interrupts are

located in this SFR.

Figure 1.9.3 shows the special function register (SFR)memory map.

q ROM

An internal ROM is located in each area shown in Table 1.9.2.

The internal ROM is used to store data tables and programs. In the internal ROM, a vector area to

store jump destination addresses upon a reset or occurrence of interrupt are assigned to addresses

FFEA16 to FFFF16 in the 7470/7471 group and to addresses FFE816 to FFFF16 in the 7477/7478 group.

Figure 1.9.4 shows the interrupt vector memory map.

Table 1.9.1 RAM area

Table 1.9.2 ROM area

Product

M3747xM2

M3747xM4/E4

M3747xM8/E8

Range

Addresses 000016 to 007F16

Addresses 000016 to 00BF16

Addresses 000016 to 00BF16, Addresses 010016 to 01BF16

Memory size

128 ! 8-bit

192 ! 8-bit

384 ! 8-bit

Product

M3747xM2

M3747xM4

M3747xE4

M3747xM8

M3747xE8

Memory size

04K ! 8-bit

08K ! 8-bit

16K ! 8-bit

Memory type

Mask ROM

Programmable ROM

Mask ROM

Programmable ROM

Range

Addresses F00016 to FFFF16

Addresses E00016 to FFFF16

Addresses C00016 to FFFF16

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