M30620FCAFP datasheet(28/274 Pages) MITSUBISHI

28 / 274 page

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Bus Control

Function

Bit symbol

Bit name

Chip select control register

Symbol

Address

When reset

CSR

000816

0116

CS1

CS0

CS3

CS2

CS0 output enable bit

CS1 output enable bit

CS2 output enable bit

CS3 output enable bit

CS1W

CS0W

CS3W

CS2W

CS0 wait bit

CS1 wait bit

CS2 wait bit

CS3 wait bit

0 : Chip select output disabled

(Normal port pin)

1 : Chip select output enabled

0 : Wait state inserted

1 : No wait state

Figure 1.9.1. Chip select control register

Processor mode

Memory expansion mode

Chip select signal

CS0

CS1

CS2

CS3

3000016 to CFFFF16

(640K bytes)

2800016 to

2FFFF16

(32K bytes)

0800016 to

27FFF16

(128K bytes)

When PM13=0

Microprocessor mode

3000016 to BFFFF16

(576K bytes)

0300016 to FFFFF16

(816K bytes)

When PM13=0

When PM13=1

0400016 to

07FFF16

(16K bytes)

0600016 to

07FFF16

(8K bytes)

Table 1.9.2. External areas specified by the chip select signals

(A product having an internal RAM of more than 15K bytes and a ROM of more than 192K bytes)

The timing of the chip select signal changing to “L”(active) is synchronized with the address bus. But the

timing of the chip select signal changing to “H” depends on the area which will be accessed in the next

cycle. Figure 1.9.2 shows the output example of the address bus and chip select signal.

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