M30620ECFS datasheet(531/621 Pages) RENESAS

531 / 621 page

External Buses

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

516

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device automatically outputs bank 7 (1, 1, 1) from the CS1, CS2, and CS3 pins each, no matter what bank

number has been set by the bank select bits. When accessing this same area for data, choose bank 7 by

setting the bank select bits first. For the area of bank 7 comprised of addresses C000016 through

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FFFFF16, the device automatically outputs bank 7 (1, 1, 1) from the CS1, CS2, and CS3 pins each, for

either program fetch or data access.

When accessing the area comprised of addresses 0400016 through 3FFFF16, for both program fetch and

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data access, the device outputs the same chip select signal from the CS1, CS2, and CS3 pins each as

output conventionally.

Figure 5.3.5 shows the Data bank register.

When alternately accessing areas across the bank boundary, you need to rewrite the bank select bits

each time. In this case, you can avoid this inconvenience by setting the Data bank register’s offset bit (bit

2 at address 0000B16) to 1, because this allows you to access said areas without having to rewrite the

bank select bits.

Figure 5.3.5. Data bank register

Data bank register

Symbol

Address

When reset

DBR

000B16

0016

Bit name

Description

Bit symbol

OFS

Offset bit

0: Not offset

1: Offset

BSR

Bank selection bits

0 0 0: Bank 0

0 0 1: Bank 1

0 1 0: Bank 2

0 1 1: Bank 3

1 0 0: Bank 4

1 0 1: Bank 5

1 1 0: Bank 6

1 1 1: Bank 7

Nothing is assigned.

In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”.

Nothing is assigned.

In an attempt to write to these bits, write “0”. The value, if read, turns out to be “0”.

b5 b4 b3

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