M38063M2AFP datasheet(31/58 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

3806 Group

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER

Processor Modes

Single-chip mode, memory expansion mode, and microprocessor

mode can be selected by changing the contents of the processor

mode bits CM0 and CM1 (bits 0 and 1 of address 003B16). In

memory expansion mode and microprocessor mode, memory can

be expanded externally through ports P0 to P3. In these modes,

ports P0 to P3 lose their I/O port functions and become bus pins.

Fig. 28 Memory maps in various processor modes

Fig. 29 Structure of CPU mode register

Single-Chip Mode

Select this mode by resetting the microcomputer with CNVSS con-

nected to VSS.

Memory Expansion Mode

Select this mode by setting the processor mode bits to “01” in soft-

ware with CNVSS connected to VSS. This mode enables external

memory expansion while maintaining the validity of the internal

ROM. Internal ROM will take precedence over external memory if

addresses conflict.

Microprocessor Mode

Select this mode by resetting the microcomputer with CNVSS con-

nected to VCC, or by setting the processor mode bits to “10” in

software with CNVSS connected to VSS. In microprocessor mode,

the internal ROM is no longer valid and external memory must be

used.

Port Name

Port P0

Port P1

Port P2

Port P3

Function

Outputs low-order byte of address.

Outputs high-order byte of address.

Operates as I/O pins for data D7 to D0

(including instruction codes).

P30 and P31 function only as output pins

(except that the port latch cannot be read).

_____

P32 is the ONW input pin.

_________

P33 is the RESETOUT output pin. (Note)

P34 is the

φ output pin.

P35 is the SYNC output pin.

___

P36 is the WR output pin, and P37 is the

___

RD output pin.

Note: If CNVSS is connected to VSS, the microcomputer goes to

single-chip mode after a reset, so this pin cannot be used

_________

as the RESETOUT output pin.

Table 2.

Functions of ports in memory expansion mode and

microprocessor mode

000016

004016

000816

000016

YYYY16

FFFF16

000816

004016

FFFF16

Internal RAM

reserved area

Internal ROM

Memory expansion mode

The shaded areas are external memory areas.

SFR area

YYYY16 is the start address of internal ROM.

SFR area

Microprocessor mode

Internal RAM

reserved area

044016

CPU mode register

(CPUM : address 003B16)

Processor mode bits

0 0 : Single-chip mode

0 1 : Memory expansion mode

1 0 : Microprocessor mode

1 1 : Not available

Stack page selection bit

0 : 0 page

1 : 1 page

Not used (return “0” when read)

b1 b0

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