TC9328AF datasheet(55/84 Pages) TOSHIBA

55 / 84 page

TC9328AF

2004-09-13

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8/4 bit

The 8/4 bit selects the length of the serial data. The length of the serial data is set at 4 bits when

this bit is “0”, and at 8 bits when this bit is “1”. If SIO is started when a serial clock is set as an

internal clock, a clock (4 bits or 8 bits) will be continuously outputted by the state of this bit.

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bit

The bit sets the serial I/O for the SO pin.

The SO pin outputs serial data when the bit is set at “0”, and the SO pin is used for serial data

input when this bit is set at “1”. This control is used as the serial bus system which outputs and

inputs serial data with one pin.

Note: Usually insert pull-up or pull-down in SO pin to prevent floating.

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Serial interface operation monitor

The operational status of the serial interface is determined by referring to the BUSY, COUNT, SIO

F/F bits.

As the BUSY bit becomes “1” during SIO operations, control data switching and serial data access

are performed when the BUSY bit is “0”. It interrupts in falling of BUSY bit and a demand is

transmitted.

COUNT bit determines if the data sending/receiving has been performed per 4 bits. When shift

operation performs with the four multiple, “0” is outputted. When it performs without the four

multiple, “1” is outputted.

“1” is set in the SIO F/F bit when the SCK pin starts shift operations.

Both COUNT bit and SIO F/F bits are reset to “0” when “1” is set in the STA bit. These two bits are

mainly used when the SCK pin sets external clocks (slave mode). An external clock is inputted and it

can be judged to be the information that serial data was transmitted and received whether operation

was performed normally.

Usually, since interruption is transmitted, interruption processing performs a serial interface end.

The example of serial operation at the time of setting it as 8 bits

SCK pin

SO pin

SI pin

BUSY

STA bit set as “1”

Interrupt

SO0

SO1

SO2

SO3

SI0

SI1

SI2

SI3

SI4

SI5

SI6

SO4

SO5

SO6

SO7

SI7

Example for Serial input-output operation

SCK pin

SO pin

Changing edge

SO0

SO1

SO2

SI0

SO3

SI1

SI2

SI3

Set STA bit to “1”

Set SO-I/O bit to “1”

Set STA bit to “1”

Set SO-I/O bit to “0”

(Note)

TC9328AF Datasheet(PDF) 55 Page - Toshiba Semiconductor

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