3886 datasheet(108/380 Pages) RENESAS

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3886 Group User’s Manual

HARDWARE

q Error check command

Input command code 8016 in the first transfer, and the

M38869FFAHP/GP outputs error information from the SDA pin,

beginning at the next falling edge of the serial clock. If the LSB bit

of the 8-bit error information is 1, it indicates that a command error

has occurred. A command error means that some invalid com-

mands other than commands shown in Table 28 has been input.

When a command error occurs, the serial communication circuit

sets the corresponding flag and stops functioning to avoid an erro-

neous programming or erase. When being placed in this state, the

serial communication circuit does not accept the subsequent serial

clock and data (even including an error check command). There-

fore, if the user wants to execute an error check command,

temporarily drop the VPP pin input to the VPPL level to terminate

the serial input/output mode. Then, place the M38869FFAHP/GP

into the serial I/O mode back again. The serial communication cir-

cuit is reset by this operation and is ready to accept commands.

The error flag alone is not cleared by this operation, so the user

can examine the serial communication circuit’s error conditions

before reset. This examination is done by the first execution of an

error check command after the reset. The error flag is cleared

when the user has executed the error check command. Because

the error flag is undefined immediately after power-on, always be

sure to execute the error check command.

Fig. 80 Timings at error checking

Note: The programming/erasing algorithm flow chart of the serial

I/O mode is the same as that of the parallel I/O mode. Re-

fer to Figure 73.

FUNCTIONAL DESCRIPTION

SCLK

BUSY

SDA

tCH

Command code input (8016)

Error flag output

00000001

??????

Note: When outputting the error flag, the SDA pin is switched for output at the first falling edge of the serial clock. The SDA pin is placed

in the floating state during the period of th(C-E) after the last rising edge of the serial clock (at the 8th bit).

“H”

“L”

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