M30622ECTFP datasheet(26/184 Pages) MITSUBISHI

26 / 184 page

Tentative Specifications REV.A

Mitsubishi microcomputers

M16C / 62T Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Specifications in this manual are tentative and subject to change.

Under

development

Memory Space Expansion Functions

The data bank register is made up of the bank selection bits (bits 5 through 3) and the offset bit (bit 2). The

bank selection bits are used to set a bank number for accessing data lying between 4000016 and

BFFFF16. Assigning 1 to the offset bit provides the means to set offsets covering 4000016.

Figure 1.8.5 shows the memory location and chip select areas in expansion mode 2.

_______

The area relevant to CS0 ranges from 4000016 through FFFFF16. As for the area from 4000016 through

_______

BFFFF16, the bank number set by use of the bank selection bits are output from the output terminals CS3

_______

- CS1 only in accessing data. In fetching a program, bank 7 (1112) is output from CS3 - CS1. As for the

_______

area from C000016 through FFFFF16, bank 7 (1112) is output from CS3 - CS1 without regard to accessing

data or to fetching a program.

_______

In accessing an area irrelevant to CS0, a chip select signal CS3 (400016 - 7FFF16), CS2 (800016 -

_______

27FFF16), and CS1 (2800016 - 3FFFF16) is output depending on the address as in the past.

Figure 1.8.6 shows an example of connecting the MCU with a 4-M byte ROM and to a 128-K byte SRAM.

_______

Connect the chip select of 4-M byte ROM with CS0. Connect M16C’s CS3, CS2, and CS1 with address

inputs A21, A20, and A19 respectively. Connect M16C’s output A19 with address input A18. Figure 1.8.7

shows the relationship between addresses of the 4-M byte ROM and those of M16C.

An example of connecting the MCU with

external memories in expansion mode 2

(M30622MC, Microprocessor mode)

D0 to D7

A0 to A16

A17

CS1

CS2

CS3

CS0

A19

D0 to D7

A0 to A16

A17

A18

A19

DQ0 to

DQ7

A0 to A16

A20

A21

Note 1. If only one chip select terminal (S1 or S2) is present,

decoding by use of an external circuit is required.

Note 2. M30623(80-pin package) is not provided with the

output pin for the chip select signal.

Note 3. The M16C/62T group is not guaranteed to operate

in memory expansion and microprocessor modes.

With no offsets effected,

banks switch from one 512-K

byte segment to another

512-K byte segment. Bank

selection bits need to be

changed in dealing with data

lying across the boundary

between banks every time a

bank switches to another.

Assigning 1 to the offset bit

brings about offsets covering

4000016 so that data can be

accessed without changing

the bank selection bits. For

instance, accessing 8000016

of bank 0 with offsets ef-

fected causes the output

bank number to turn to 1, and

AD19 is inverted to be out-

put; this results in accessing

4000016 of bank 1.

On the other hand, the

SRAM’s chip select assumes

_______

that CS0=1 (not selected)

_______

and CS2=0 (selected), so

_______

connect CS0 with S2 and

_______

____

CS2 with S1. If the SRAM

doesn’t have a bipolar chip

select input terminal, decode

_______

CS0 and CS2 externally.

Figure 1.8.6. An example of connecting the MCU with external

memories in expansion mode 2

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