TMP86CS49FG datasheet(176/252 Pages) TOSHIBA

176 / 252 page

Page 162

14. Synchronous Serial Interface (SIO1)

14.3 Function

TMP86CS49FG

14.3 Function

14.3.1 Serial clock

14.3.1.1 Clock source

The serial clock can be selected by using SIO1CR<SCK>. When the serial clock is changed, the writing

instruction to SIO1CR<SCK> should be executed while the transfer is stopped (when SIO1SR<SIOF>

“0”)

(1) Internal clock

Setting the SIO1CR<SCK> to other than “111B” outputs the clock (shown in " Table 14-1 Serial

Clock Rate (fc = 16 MHz, fs = 32.768kHz) ") as serial clock outputs from SCK1 pin. At the before

beginning or finishing of a transfer, SCK1 pin is kept in high level.

When writing (in the transmit mode) or reading (in the receive mode) data can not follow the serial

clock rate, an automatic-wait function is executed to stop the serial clock automatically and hold the

next shift operation until reading or writing is completed (shown in " Figure 14-2 Automatic-wait

Function (Example of transmit mode) "). The maximum time from releasing the automatic-wait

function by reading or writing a data is 1 cycle of the selected serial clock until the serial clock comes

out from SCK1 pin.

Figure 14-2 Automatic-wait Function (Example of transmit mode)

Table 14-1 Serial Clock Rate (fc = 16 MHz, fs = 32.768kHz)

NORMAL1/2, IDLE1/2 Mode

SLOW1/2, SLEEP1/2 Mode

TBTCR<DV7CK> = "0"

TBTCR<DV7CK> = "1"

Serial Clock

Baud Rate

SCK

Serial Clock

Baud Rate

Serial Clock

Baud Rate

000

fc/212

3.906 kbps

fs/24

2048 bps

fs/24

2048 bps

001

fc/28

62.5 kbps

fc/28

62.5 kbps

Reserved

–

010

fc/27

125 kbps

fc/27

125 kbps

Reserved

–

011

fc/26

250 kbps

fc/26

250 kbps

Reserved

–

100

fc/25

500 kbps

fc/25

500 kbps

Reserved

–

101

fc/24

1.00 Mbps

fc/24

1.00 Mbps

Reserved

–

110

fc/23

2.00 Mbps

fc/23

2.00 Mbps

Reserved

Automatically wait

B7 B6 B5 B4 B3

B2 B1 B0

SIO1CR<SIOS>

SO1 pin

SIO1TDB

Automatic wait is released by writing SIO1TDB

SCK1

pin output

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