M16CSLASH62P datasheet(45/349 Pages) MITSUBISHI

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Mitsubishi microcomputers

M16C / 62P Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Memory Space Expansion Function

Under

development

Preliminary Specifications Rev.1.0

Specifications in this manual are tentative and subject to change.

Memory Space Expansion Function

The following describes a memory space extension function.

During memory expansion or microprocessor mode, the memory space expansion function allows the

access space to be expanded using the appropriate register bits.

Table 1.8.1 shows the way of setting memory space expansion function, memory spaces.

Table 1.8.1. The Way of Setting Memory Space Expansion Function, Memory Space

Memory space expansion function

How to set (PM15 to PM14)

Memory space

1 Mbytes mode

002

1 Mbytes (no expansion)

4 Mbytes mode

112

4 Mbytes

(1) 1 Mbyte Mode

In this mode, the memory space is 1 Mbytes. In 1 Mbyte mode, the external area to be accessed is

______

specified using the CSi (i = 0 to 3) signals (hereafter referred to as the CSi area). Figures 1.8.2 to 1.8.3

_____

show the memory mapping and CS area in 1 Mbyte mode.

(2) 4 Mbyte Mode

In this mode, the memory space is 4 Mbytes. Figure 1.8.1 shows the DBR register. The BSR2 to BSR0

bits select a bank number which is to be accessed to read or write data. Setting the OFS bit to “1” (with

offset) allows the accessed address to be offset by 4000016.

______

In 4 Mbyte mode, the CSi (i=0 to 3) pin functions differently for each area to be accessed.

Addresses 0400016 to 3FFFF16, C000016 to FFFFF16

______

• The CSi signal is output from the CSi pin (same operation as 1 Mbyte mode. However the last address

_______

of CS1 area is 3FFFF16)

Addresses 4000016 to BFFFF16

______

• The CS0 pin outputs “L”

______

• The CS1 to CS3 pins output the value of the BSR2 to BSR0 bits (bank number)

______

Figures 1.8.4 to 1.8.5 show the memory mapping and CS area in 4 Mbyte mode. Note that banks 0 to 6

______

are data-only areas. Locate the program in bank 7 or the CSi area.

Figure 1.8.1. DBR Register

Data bank register (Note)

Symbol

Address

After reset

DBR

000B16

0016

Bit name

Description

Bit symbol

OFS

Offset bit

0: Not offset

1: Offset

BSR0

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. When write, set to “0”. When read, its content is

“0”.

Nothing is assigned. When write, set to “0”. When read, its content is

“0”.

b5 b4 b3

BSR1

BSR2

(b1-b0)

(b7-b6)

Note : Effective when the PM01 to PM00 bits are set to “012” (memory expansion mode) or “112” (microprocessor

mode).

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