UPD784026 Renesas Electronics Corporation., UPD784026 Datasheet - Page 497

• Manufacturer Part Number: UPD784026
• Description: 16/8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(3) Shift register (SIO)
drain configuration, and a wired-OR configuration is achieved by means of an external pull-up resistor. Therefore, a device
which is about to perform reception must set FFH in the SIO or set the transmission disabled state.
In the SBI data bus configuration, the input pin and output pin have a dual function. The output pin has an N-ch open-
SIO is an 8-bit shift register that performs parallel-to-serial conversion.
Data written to SIO is output to the serial data bus, and data is read from the serial data bus into SIO. The configuration
around the SIO is shown in Figure 17-13.
Wired-OR Connection
Figure 17-13 Configuration Around Shift Register (SIO)
Shift Register (SIO)
CHAPTER 17 CLOCKED SERIAL INTERFACE
N-ch Open-Drain Output
Shift Clock
Internal Bus
8
SET
D
CLK
BUSY/ACK
CLR
Q
SO Latch
RELT
CMDT
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