M16CSLASH62 datasheet(527/621 Pages) RENESAS

527 / 621 page

External Buses

Mitsubishi microcomputers

M16C / 62 Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

512

5.3 Memory Space Expansion Features

Here follows the description of the memory space expansion function.

(1) Normal Mode

1M byte memory space

(2) Memory space expansion mode1 1.2M byte memory space

(3) Memory space expansion mode2 4M byte memory space

Use bits 5 and 4(PM15,PM14) of processor mode register 1 to select a desired mode.Figure 5.3.1 shows

the processor mode register 1.

Figure 5.3.1. Processor mode register 1

Processor mode register 1 (Note 1)

Symbol

Address

When reset

PM1

000516

00000XX02

Bit name

Function

Bit symbol

Nothing is assigned.

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

out to be indeterminate.

Reserved bit

Must always be set to “0”

Note 1: Set bit 1 of the protect register (address 000A16) to “1” when writing new values to this register.

Note 2: Be sure to set this bit to 0 except products whose RAM size and ROM size exceed 15K bytes

and 192K bytes respectively.

In using M30624MG/FG, a product having a RAM of more than 15K bytes and a ROM of more

than 192K bytes, set this bit to 1 at the beginning of user program.

Specify D000016 or a subsequent address, which becomes an internal ROM area if PM13 is set

to “0” at the time reset is revoked, for the reset vector table of user program.

Note 3: With the processor running in memory expansion mode or in microprocessor mode, setting this

bit provides the means of expanding the external memory area. (Normal mode: up to 1M byte,

expansion mode 1: up to 1.2 M bytes, expansion mode 2: up to 4M bytes)

For details, see “Memory space expansion functions”.

PM17

Wait bit

0 : No wait state

1 : Wait state inserted

Memory area

expansion bit (Note 3)

0 0 : Normal mode

(Do not expand)

0 1 : Inhibited

1 0 : Memory area expansion

mode 1

1 1 : Memory area expansion

mode 2

b5 b4

PM15

PM14

Reserved bit

Must always be set to “0”

Internal reserved area

expansion bit (Note 2)

PM13

0: The same internal reserved

area as that of M16C/60 and

M16C/61 group

1: Expands the internal RAM area

and internal ROM area to 23 K

bytes and to 256K bytes

respectively. (Note 2)

M16C/62 Datasheet(PDF) 527 Page - Renesas Technology Corp

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