M38B53M4-059FP datasheet(50/355 Pages) MITSUBISHI

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38B5 Group User’s Manual

1-34

HARDWARE

FUNCTIONAL DESCRIPTION

When the internal synchronous clock is selected, in the 8-bit serial

I/O mode and the automatic transfer serial I/O mode (SBUSY1 out-

put function outputs in 1-byte units), the SBUSY1 output goes to “L”

and the SBUSY1 output goes to “H” before 0.5 cycle (transfer clock)

of the timing at which the transfer clock from the SCLK1 output goes

to “L” at a start of transmit/receive operation.

In the automatic transfer serial I/O mode (the SBUSY1 output func-

tion outputs all transfer data), the SBUSY1 output goes to “L” and the

SBUSY1 output goes to “H” when the first transmit data is written into

the serial I/O1 register (address 001B16).

When the external synchronous clock is selected, the SBUSY1 out-

put goes to “L” and the SBUSY1 output goes to “H” when transmit

data is written into the serial I/O1 register to start a transmit opera-

tion, regardless of the serial I/O transfer mode.

At termination of transmit/receive operation, the SBUSY1 output re-

turns to “H” and the SBUSY1 output returns to “L”, the initial status,

when the serial transfer status flag is set to "0", regardless of whether

the internal or external synchronous clock is selected.

Furthermore, in the automatic transfer serial I/O mode (SBUSY1 out-

put function outputs in 1-byte units), the SBUSY1 output goes to “H”

and the SBUSY1 output goes to “L” each time 1-byte of receive data

is written into the automatic transfer RAM.

Fig. 29 SBUSY1 output operation

(internal synchronous clock, 8-bits serial I/O)

Fig. 30 SBUSY1 output operation

(external synchronous clock, 8-bits serial I/O)

Fig. 31 SBUSY1 output operation in automatic transfer serial I/O mode

(internal synchronous clock, SBUSY1 output function outputs each 1-byte)

SBUSY1

SCLK1

SOUT1

Serial transfer

status flag

Serial transfer

status flag

SBUSY1

SCLK1

Write to Serial

I/O1 register

SCLK1

SBUSY1

SOUT1

Automatic transfer

interval

Serial transfer

status flag

Automatic transfer RAM

→Serial I/O1 register

Serial I/O1 register

→Automatic transfer RAM

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