7477 datasheet(45/354 Pages) RENESAS

tên linh kiện	7477

Giải thích chi tiết về linh kiện	8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES

PDF	354 Pages

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HARDWARE

1.8 Access area

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

1-28

1.8 Access area

In the 7470/7471/7477/7478 group, all ROM, RAM and I/O and the various control registers are located in

the same memory area. Accordingly, the same instructions are used for data transfer and arithmetic

operations without discriminating between a memory and an I/O.

The Program counter consists of 16 bits and the access space is 64K-byte of memory area: addresses

000016 to FFFF16.

The area of the least significant 256 bytes (addresses 000016 to 00FF16) is called the “zero page,” and

memories with a high frequency of use such as internal RAM, I/O ports and timers are located here. The

area of the most significant 256 bytes (addresses FF0016 to FFFF16) is called the “special page,” and an

internal ROM and interrupt vectors are located here.

The zero page and the special page can be accessed with 2 bytes by using each special addressing mode.

Figure 1.8.1 shows an outline of accsess area.

Fig. 1.8.1 Access area

Interrupt vector area

ROM

RAM

SFR area

000016

00C016

00FF16

FFFF16

FF0016

Zero page

Special page

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