TMP88CS38FG datasheet(102/226 Pages) TOSHIBA

102 / 226 page

TMP88CS38/CM38A/CP38A

2007-09-12

88CS38-102

2.9.9

Clocked-synchronous 8-Bit SIO Mode Control

The following registers are used to control the serial bus interface (SBI) and monitor the

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

Serial Bus Interface Control Register A

SBICRA

(00020H)

SIOS

SIOINH

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

DV1CK

= 0

DV1CK

= 1

SCK

Serial clock selection

(at fc

= 16 MHz, Output on SCK

pin)

000: 1000.0 kHz

001:

500.0 kHz

010:

250.0 kHz

011:

125.0 kHz

100:

62.5 kHz

101:

31.2 kHz

110:

15.6 kHz

111: External clock

(Input from SCK pin)

000:

500.0 kHz

001:

250.0 kHz

010:

125.0 kHz

011:

62.5 kHz

100:

31.2 kHz

101:

15.6 kHz

110:

7.8 kHz

111: External clock

(Input from SCK pin)

Write

only

Note 1:

fc: High-frequency clock [Hz], *: Don’t care

Note 2:

Clear the SIOS to “0” and set the SIOINH to “1” when setting the transfer mode and serial clock.

Note 3:

SBICRA is write-only register and cannot be used with any of read-modify-write instructions such as bit

manipulation, etc.

Serial Bus Interface Data Register

SBIDBR

(00021H)

(Initial value: **** ****)

R/W

Note1 :

The data which was written into SBIDBR cannot be read, since a write buffer and a read buffer are

independent in SBIDBR. Therefore, SBIDBR cannot be used with any of read-modify-write instructions

such as bit manipulation, etc.

Note 2: *: Don’t care

Serial Bus Interface Control Register B

SBICRB

(00023H)

“0”

“1”

SBIM

SWRST1 SWRST0

(Initial value: **** 0000)

SBIM

Serial bus interface operation

mode selection

00: Port mode (Serial bus interface output disable)

01: SIO mode

10: I

2C bus mode

11: Reserved

SWRST1

SWRST0

Software reset start bit

Software reset starts by first writing “10” and next writing “01”

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 I

2C bus mode or clock synchronous 8-bit SIO mode after confirming that the port is high

level.

Note 4:

SBICRB is a write-only register and cannot be used with any of read-modify-write instructions such as bit

manipulation, etc.

Note 5:

Clear bit7 to 5 in SBICRB to “0”, and set bit4 to “1”.

Note 6:

When the SWRST (Bit1, 0 in SBICRB) is written to “01”, “10”, software reset is occurred.

This time, control the serial bus interface and monitor the operation status registers except the SBIM (Bit3,

2 in SBICRB) and the CHS (Bit6 in PMPXCR) are reseted.

Control the serial bus interface and monitor the operation status registers are SBICRA, SBICRB, SBIDBR,

I2CAR, SBISRA, SBISRB, SCCRA, SCCRB and SCSR.

Figure 2.9.19 Control Register/Data Buffer Register/Status Register in SIO Mode (1)

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