M30622ECTFP datasheet(35/184 Pages) MITSUBISHI

35 / 184 page

Mitsubishi microcomputers

M16C / 62T Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

Bus Control

(4) ALE signal

The ALE signal latches the address when accessing the multiplex bus space. Latch the address when the

ALE signal falls.

When BYTE pin = “H”

When BYTE pin = “L”

ALE

Address

Data (Note 1)

Address (Note 2)

D0/A0 to D7/A7

A8 to A19

ALE

Address

Data (Note 1)

Address

D0/A1 to D7/A8

A9 to A19

Address

Note 1: Floating when reading.

Note 2: When multiplexed bus for the entire space is selected, these are I/O ports.

Note 3: In M30623 (80-pin package), P10 to P17 which are in common with D8 to D15 are available.

So, M30623 (80-pin package) can operate only when BYTE pin = “H” (the width of external

data bus is 16-bit).

Figure 1.12.2. ALE signal and address/data bus

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(5) The RDY signal

________

RDY is a signal that facilitates access to an external device that requires long access time. As shown in

________

Figure 1.12.3, if an “L” is being input to the RDY at the BCLK falling edge, the bus turns to the wait state. If

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an “H” is being input to the RDY pin at the BCLK falling edge, the bus cancels the wait state. Table 1.12.4

shows the state of the microcomputer with the bus in the wait state, and Figure 1.12.3 shows an example in

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________

which the RD signal is prolonged by the RDY signal.

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The RDY signal is valid when accessing the external area during the bus cycle in which bits 4 to 7 of the

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chip select control register (address 000816) are set to “0”. The RDY signal is invalid when setting “1” to all

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bits 4 to 7 of the chip select control register (address 000816), but the RDY pin should be treated as properly

as in non-using.

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Note 1: The RDY signal cannot be received immediately prior to a software wait.

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Note 2: In M30623(80-pin package), CS signals have no corresponding external pin.

Table 1.12.4. Microcomputer status in ready state (Note 1)

Item

Status

Oscillation

___

_____

R/W signal, address bus, data bus, CS

________

Maintain status when RDY signal received

__________

ALE signal, HLDA, programmable I/O ports

Internal peripheral circuits

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