TC9446FG datasheet(13/41 Pages) TOSHIBA

13 / 41 page

TC9446FG

2005-09-28

Incorrect operation detection

Incorrect operation detection of the internal program of TC9446FG can be made to perform by

setting the incorrect operation detection start bit in a 24 bit command to “H”. As for this incorrect

operation detection start bit, the reversal output only of the case of MICS terminal = “H” is carried

out from MIACK terminal.

And, since this incorrect operation detection start bit is periodically cleared by “L” when an internal

program is operating normally, MIACK terminal at the time of MICS terminal = “H” is set to “H”

from “L”.

However, since it will stop being cleared if an internal program becomes a incorrect operation state,

as for MIACK terminal at the time of MICS terminal = “H”, the state of “L” will continue.

Thus incorrect operation detection of a program is attained by supervising MIACK terminal at the

time of MICS terminal = “H”. Moreover, although it checks that MIACK terminal is “L” after setting

MICS terminal to “L” in case a MCU starts access to TC9446FG, MCU can judge that an internal

program is a incorrect operation state, when the state of MIACK = “H” continues.

In addition, when a incorrect operation state is detected, it can return from a incorrect operation

state by initializing by transmitting the soft reset command which the reset terminal was set to “L” or

was mentioned above.

The procedure of incorrect operation detection is shown in Figure 6.

Figure 6

Procedure of Incorrect Operation Detection

MICS

= “L”

Checking of MIACK

= “L”

(waiting for becoming to MIACK

= “L” at the MIACK = “H”)

Transmission of 24 bit command

(starting the incorrect operation detection

= 000080h)

Program makes to clear the incorrect operation

detection bit

MIACK

= “H”

It starts the incorrect operation detection

by “1”.

MICS

= “H”

MIACK

= “L”

When not set to “L” with “H”, it is the state

of incorrect operation.

MIACK

= “L” is continue at incorrect

operation, as detection bit isn’t cleared.

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