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7477 Datasheet(PDF) 35 Page - Renesas Technology Corp

Part # 7477
Description  8-BIT SINGLE-CHIP MICROCOMPUTER 740 FAMILY / 7470 SERIES
PDF  361 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

7477 Datasheet(HTML) 35 Page - Renesas Technology Corp

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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
RAM
SFR area
000016
00C016
00FF16
FFFF16
FF0016
Zero page
Special page



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