M30622ECTFP datasheet(33/184 Pages) MITSUBISHI

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Mitsubishi microcomputers

M16C / 62T Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Bus Control

The following explains the signals required for accessing external devices and software waits. The signals

required for accessing the external devices are valid when the processor mode is set to memory expansion

mode and microprocessor mode. The software waits are valid in all processor modes.

M30623(80-pin package), in which the BYTE pin is connected to the CNVSS pin, and the external data bus

width can be used 8 bits.

M16C/62T group is not guaranteed to operate in memory expansion and microprocessor modes.

(1) Address bus/data bus

The address bus consists of the 20 pins A0 to A19 for accessing the 1M bytes of address space.

The data bus consists of the pins for data I/O. When the BYTE pin is “H”, the 8 ports D0 to D7 function

as the data bus. When BYTE is “L”, the 16 ports D0 to D15 function as the data bus.

When a change is made from single-chip mode to memory expansion mode, the value of the address

bus is undefined until external memory is accessed.

(2) Chip select signalIn (In M30623(80-pin package), the chip select signals have no corresponding

external pin.)

The chip select signal is output using the same pins as P44 to P47. Bits 0 to 3 of the chip select control

select control register is valid in memory expansion mode and microprocessor mode. In single-chip

mode, P44 to P47 function as programmable I/O ports regardless of the value in the chip select control

_______

In microprocessor mode, only CS0 outputs the chip select signal after the reset state has been can-

_______

celled. CS1 to CS3 function as input ports. Figure 1.12.1 shows the chip select control register.

The chip select signal can be used to split the external area into as many as four blocks. Tables 1.12.1

and 1.12.2 show the external memory areas specified using the chip select signal.

Memory space

expansion mode

Normal mode

(PM15,14=0,0)

Expansion

mode 1

(PM15,14=1,0)

Expansion

mode 2

(PM15,14=1,1)

Processor mode

Memory expansion

mode

Microprocessor

mode

3000016 to

FFFFF16

(832K bytes)

0400016 to

CFFFF16

(816K bytes)

0400016 to

FFFFF16

(1008K bytes)

4000016 to

FFFFF16

(512K bytes ! 8)

2800016 to

2FFFF16

(32K bytes)

2800016 to

3FFFF16

(96K bytes)

0800016 to

27FFF16

(128K bytes)

0400016 to

07FFF16

(16K bytes)

Chip select signal

4000016 to

BFFFF16

(512K bytes ! 7

+ 256K bytes)

3000016 to

CFFFF16

(640K bytes)

Memory expansion

mode

Microprocessor

mode

Memory expansion

mode

Microprocessor

mode

CS0

CS1

CS2

CS3

Note 1: In M30623(80-pin package), the chip select signals have no corresponding external pin.

Note 2: The M16C/62T Group is not guaranteed to operate in memory expansion and microprocessor

modes.

Table 1.12.1. External areas specified by the chip select signals

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