TMP93CS44 datasheet(173/224 Pages) TOSHIBA

173 / 224 page

TMP93CS44/S45

2004-02-10

93CS44-171

Figure 3.10.24 Transmitted Data Hold Time at End of Transmit

2. 8-bit receive mode

Set the control register to a receive mode and SBICR1<SIOS> to 1 for switching

to the receive mode. Data is received from the SI pin to the shift register in

synchronous with the serial clock, starting from the least significant bit (LSB).

When the 8-bit data is received, the data is transferred from the shift register to

the SBIDBR. The INTS2 (Buffer full) interrupt request is generated to request to

read the received data. The data is then read from the SBIDBR by the interrupt

service program.

When the internal clock is used, the serial clock will stop and automatic-wait

function will be initiated until the received data is read from the SBIDBR.

When the external clock is used, since shift operation is synchronized with the

clock pulse provided externally, the received data should be read from the

SBIDBR before next serial clock input. If the received data is not read, further

data to be received is canceled. The maximum transfer speed when the external

clock is used is determined by the delay time between the time when an interrupt

request is generated and the time when received data is read.

Receiving data is ended by clearing <SIOS> to 0 with the buffer full interrupt

service program or setting SBICR1<SIOINH> to 1. When <SIOS> is cleared,

received data is transferred to the SBIDBR in complete blocks. The received mode

ends when the transfer is complete. In order to confirm if data is surely received

by the program, set SBISR<SIOF> to be sensed. <SIOF> is cleared to 0 when

receiving is complete. After confirming that receiving has ended, the last data is

read. When <SIOINH> is set to 1, receiving data stops. <SIOF> turns 0 (the

received data becomes invalid, therefore no need to read it).

Note:

When the transfer mode is switched, the SBIDBR contents are lost. In case

that the mode needs to be switched, receiving data is concluded by clearing

<SIOS> to 0, read the last data, and then switch the mode.

SCK pin

Bit7

Bit6

<SIOF>

SO pin

tSODH = Min 3.5/fFPH [s] (in NORMAL mode)

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