TMP88CU74F datasheet(96/132 Pages) TOSHIBA

96 / 132 page

TMP88CU74

2003-02-17

88CU74-96

2.10.6

Clocked-synchronous 8-Bit SIO Mode Control

The following registers are used to control the serial bus interface (SBI-ver.C) and

monitor the operation status in the clocked-synchronous 8-bit SIO mode.

Serial Bus Interface Control Register 1

SBICR1

(00020H)

SIOS

SIO

INH

SIOM

“0”

SCK

(Initial value: 0000

*000)

SIOS

Indicate transfer start/stop

0: Stop

1: Start

SIOINH

Continue/Abort transfer

0: Continue transfer

1: Abort transfer (automatically cleared after abort)

SIOM

Transfer mode select

00: 8-bit transmit mode

01: Reserved

10: 8-bit transmit/receive mode

11: 8-bit receive mode

SCK

Serial clock select

000: fc/2

(390 kHz)

001: fc/2

(195 kHz)

010: fc/2

7 (97.6 kHz)

011: fc/2

8 (48.8 kHz)

100: fc/2

9 (24.4 kHz)

101: fc/2

10 (12.2 kHz)

110: fc/2

(6.1 kHz)

111: External clock (input from SCK pin)

Write

only

Note 1:

*: Don’t care

Note 2:

Set the SIOS to “0” when setting the transfer mode or serial clock.

Note 3:

SBICR1 is write-only register, which cannot be used with any of read-modify-write instruction such as bit

manipulation, etc.

Serial Bus Interface Data Buffer Register

SBIDBR

(00021H)

R/W

Note:

Cannot read the data which was written into SBIDBR, since a write data buffer and a read buffer are

independent in SBIDBR. Therefore, SBIDBR cannot be used with any in read-modify-write instruction such as

bit manipulation, etc.

Serial Bus Interface Control Register 2

SBICR2

(00023H)

“0”

“1”

SBIM

“0”

(Initial value:

**** 00**)

SBIM

Serial bus interface operation

mode selection

00: Port mode (serial bus interface output disable)

01: Clocked-synchronous 8-bit SIO mode

10: I

2C bus mode

11: Reserved

Write

only

Note 1:

*: Don’t care

Note 2:

Switch a mode to port after data transfer is complete.

Note 3:

Switch a mode to I2C bus mode or clocked-synchronous 8-bit SIO mode after confirming that input signal via

port is high level.

Note 4:

SBICR2 is write-only register, which cannot be used with any of read-modify-write instruction such as bit

manipulation, etc.

Note 5:

Clear bits 7 to 5 and bits 1 to 0 in SBICR2 to “0”, and set bit 4 to “1”.

Serial Bus Interface Status Register

SBISR

(00023H)

“1”

SIOF

SEF

“1”

SIOF

Serial

transfer

operating

status monitor

0 : Transfer terminated

1 : Transfer in process

SEF

Shift operating status monitor

0 : Shift operation terminated

1 : Shift operation in process

Read

only

Figure 2.10.17 Control Register/Data Buffer Register/Status Register in SIO Mode

at fc

= 12.5 MHz

(Output on SCK pin)

2007-10-19

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