TMP86CS64AFG datasheet(156/202 Pages) TOSHIBA

156 / 202 page

Page 146

15. Synchronous Serial Interface (SIO1)

15.2 Control

TMP86CS64AFG

15.2 Control

The serial interface is controlled by SIO control registers (SIO1CR1/SIO1CR2). The serial interface status can be

determined by reading SIO status register (SIO1SR).

The transmit and receive data buffer is controlled by the SIO1CR2<BUF>. The data buffer is assigned to address

0F90H to 0F97H 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 (INTSIO1) 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 SIO1CR2<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: SIO1CR1 is write-only register, which cannot access any of in read-modify-write instruction such as bit operate, etc.

SIO Control Register 1

SIO1CR1

76543

210

(0028H)

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

DV1CK = 0 DV1CK = 1 DV1CK = 1 DV1CK = 1

000

fc/213

fc/214

fs/25

001

fc/28

fc/29

fc/28

fc/29

010

fc/27

fc/28

fc/27

fc/28

011

fc/26

fc/27

fc/26

fc/27

100

fc/25

fc/26

fc/25

fc/26

101

fc/24

fc/25

fc/24

fc/25

110

Reserved

111

External clock (Input from SCK1 pin )

SIO Control Register 2

SIO1CR2

54321

(0029H)

WAIT

BUF

(Initial value: ***0 0000)

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