Zilog EZ80F91 - Manual (Page 28)

eZ80F91 Development Kit
User Manual
UM014220-0508 eZ80 Development Kit
23
GPIO Emulation
GPIO is emulated with the use of the GPIO Output Control Register and
the GPIO Data Register.
Table 9 lists the multiple functions of the register.
The GPIO Data Register receives inputs or provides outputs for each of
the seven GPIO lines, depending on the configuration of the port. See
Table 10 .
Table 8. LED and Port Emulation Addresses
Address Register Function Access
800000h LED Anode/GPIO Port output control WR
800001h LED Cathode/Modem/Trig WR
800002h GPIO Data RD/WR
Table 9. LED Anode/GPIO Output Control Register
Function
Bit #
7 6 5 4 3 2 1 0
Anode Col 1 X
Anode Col 2 X
Anode Col 3 X
Anode Col 4 X
Anode Col 5 X
Anode Col 6 X
Anode Col 6 X
GPIO Output X