NEC switch - Manual (Page 155)

CHAPTER 9 SERIAL INTERFACE 10
User’s Manual U12978EJ3V0UD
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9.2 Configuration of Serial Interface 10
Serial interface 10 consists of the following hardware.
Table 9-1. Configuration of Serial Interface 10
Item Configuration
Register Transmit/receive shift register 10 (SIO10)
Control register Serial operating mode register 10 (CSIM10)
(1) Transmit/receive shift register 10 (SIO10)
This is an 8-bit register used for parallel-to-serial conversion and to perform serial data transmission/reception in
synchronization with the serial clock.
SIO10 is set with an 8-bit memory manipulation instruction.
RESET input makes SIO10 undefined.