TMP89FS60 datasheet(254/410 Pages) TOSHIBA

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Page 240

17. Synchronous Serial Interface (SIO)

17.2 Control

TMP89FS60

RA001

Note 1: fcgck: Gear clock [Hz], fs: Low-frequency clock [Hz]

Note 2: After the operation is started by writing "1" to SIOS, writing to SIOEDG, SIOCKS and SIODIR is invalid until

SIO0SR<SIOF> becomes "0". (SIOEDG, SIOCKS and SIODIR can be changed at the same time as changing SIOS from

"0" to "1".)

Note 3: After the operation is started by writing "1" to SIOS, no values other than"00" can be written to SIOM until SIOF becomes

"0" (if a value from "01" to "11" is written to SIOM, it is ignored). The transfer mode cannot be changed during the opera-

tion.

Note 4: SIOS remains at "0", if "1" is written to SIOS when SIOM is "00" (operation stop).

Note 5: When SIO is used in SLOW1/2 or SLEEP1 mode, be sure to set SIOCKS to "110". If SIOCKS is set to any other value,

SIO will not operate. When SIO is used in SLOW1/2 or SLEEP1 mode, execute communications with SIOCKS="110" in

advance or change SIOCKS after SIO is stopped.

Note 6: When STOP, IDLE0 or SLEEP0 mode is activated, SIOM is automatically cleared to "00" and SIO stops the operation. At

the same time, SIOS is cleared to "0". However, the values set for SIOEDG, SIOCKS and SIODIR are maintained.

Serial interface control register

SIO0CR

76543

210

(0x001F)

Bit Symbol

SIOEDG

SIOCKS

SIODIR

SIOS

SIOM

Read/Write

R/W

After reset

00000

000

SIOEDG

Transfer edge selection

0: Receive data at a rising edge and transmit data at a falling edge

1: Transmit data at a rising edge and receive data at a falling edge

SIOCKS

Serial clock selection [Hz]

NORMAL1/2 or IDLE1/2 mode

SLOW1/2 or SLEEP1 mode

000

fcgck/29

001

fcgck/26

010

fcgck/25

011

fcgck/24

100

fcgck/23

101

fcgck/22

110

fcgck/2

fs/23

111

External clock input

SIODIR

Transfer format (MSB/LSB) selec-

tion

LSB first (transfer from bit 0)

MSB first (transfer from bit 7)

SIOS

Transfer operation start/stop

instruction

0: Operation stop (reserved stop)

1: Operation start

SIOM

Transfer mode selection and

operation

Operation stop (forced stop)

8-bit transmit mode

8-bit receive mode

8-bit transmit and receive mode

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