TMP86FS28DFG datasheet(164/272 Pages) TOSHIBA

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Page 152

11. Synchronous Serial Interface (SIO)

11.2 Control

TMP86FS28DFG

11.2 Control

The serial interface is controlled by SIO control registers (SIOCR1/SIOCR2). The serial interface status can be

determined by reading SIO status register (SIOSR).

The transmit and receive data buffer is controlled by the SIOCR2<BUF>. The data buffer is assigned to address

0F60H to 0F67H for SIO in the DBR area, and can continuously transfer up to 8 words (bytes or nibbles) at one time.

When the specified number of words has been transferred, a buffer empty (in the transmit mode) or a buffer full (in

the receive mode or transmit/receive mode) interrupt (INTSIO) is generated.

When the internal clock is used as the serial clock in the 8-bit receive mode and the 8-bit transmit/receive mode, a

fixed interval wait can be applied to the serial clock for each word transferred. Four different wait times can be

selected with SIOCR2<WAIT>.

Note 1: fc; High-frequency clock [Hz], fs; Low-frequency clock [Hz]

Note 2: Set SIOS to "0" and SIOINH to "1" when setting the transfer mode or serial clock.

Note 3: SIOCR1 is write-only register, which cannot access any of in read-modify-write instruction such as bit operate, etc.

SIO Control Register 1

SIOCR1

76543

210

(0F68H)

SIOS

SIOINH

SIOM

SCK

(Initial value: 0000 0000)

SIOS

Indicate transfer start / stop

Stop

Write

only

Start

SIOINH

Continue / abort transfer

Continuously transfer

Abort transfer (Automatically cleared after abort)

SIOM

Transfer mode select

000:

8-bit transmit mode

010:

4-bit transmit mode

100:

8-bit transmit / receive mode

101:

8-bit receive mode

110:

4-bit receive mode

Except the above: Reserved

SCK

Serial clock select

NORMAL1/2, IDLE1/2 mode

SLOW1/2

SLEEP1/2

mode

Write

only

DV7CK = 0

DV7CK = 1

000

fc/213

fs/25

001

fc/28

010

fc/27

011

fc/26

100

fc/25

101

fc/24

110

Reserved

111

External clock ( Input from SCK pin )

SIO Control Register 2

SIOCR2

54321

(0F69H)

WAIT

BUF

(Initial value: ***0 0000)

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