tmp89fm82t TOSHIBA Semiconductor CORPORATION, tmp89fm82t Datasheet - Page 287

• Manufacturer Part Number: tmp89fm82t
• Description: 8 Bit Microcontroller
• Manufacturer: TOSHIBA Semiconductor CORPORATION

RA000
17.6
from its MISO pin to the master device’s MISO pin. This means that data are exchanged between master and slave
via full-duplex communication, with data output and input operations synchronized by the same clock signal. After
end of transfer, the transmit byte in 8 bit shift register is replaced with the receive byte.
transfer can be programmed to be open-drain outputs. This feature enables these pins to be connected with multiple
devices. (We recommend using these pins in open-drain output mode.)
SEI device is set as the master and all the other SEI devices on the SEI bus are set as slaves. The master device sends
data from its SECLK and MOSI pins to the SECLK and MOSI pins of a slave device.
Figure 17-4 shows how the SEI master and slave are connected.
When the master device sends data from its MOSI pin to a slave device’s MOSI pin, the slave device returns data
Figure 17-5 shows an example of how an SEI system can be configured. The general-purpose pins used for SEI
In this example, all the SECLK pins are interconnected, and all the MOSI and MISO pins are interconnected. One
The slave device selected by the master sends data from its MISO pin to the MISO pin of the master device.
Functional Description
Figure 17-5 Example of SEI System Configuration (1 Master, 2 Slaves)
SEI clock
Port0 Port1
8-bit shift register
Master
Figure 17-4 Master and Slave Connection in SEI
VDD
SS SECLK MOSI MISO
Master
MOSI
MISO
SECLK
SS
SS SECLK MOSI MISO
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5 V
Slave 0
0V
SECLK
MOSI
MISO
SS
SS SECLK MOSI MISO
Slave 1
8-bit shift register
Slave
TMP89FM82T