NEC switch - Manual (Page 59)

CHAPTER 4 PORT FUNCTIONS
User’s Manual U12978EJ3V0UD
59
4.2 Port Configuration
Ports consists the following hardware.
Table 4-2. Configuration of Port
Parameter Configuration
Control registers Port mode register (PMm: m = 0 to 2, 4)
Pull-up resistor option register (PU0)
Port output mode register (POMm: m = 0, 1)
Ports Total: 31 (N-ch open-drain output is specifiable for 18 ports.)
Pull-up resistors Software control: 31