Zilog EZ80190 - Manual (Page 28)

eZ80190 Development Kit
User Manual
eZ80Acclaim! Development Platform UM014108-0810
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Table 6 lists the memory map addresses to registers that allow access to the
above functions. The register at address
800000h controls general-pur-
pose port output control and LED anode register functions. The register at
address
800001h controls the register functions for the LED cathode,
modem reset, and user triggers. Address 800002h controls general-pur-
pose port data.
General-Purpose Port
The general-purpose port is emulated with the use of the GPIO Output
Control Register and the GPIO Data Register. If bit 7 in the GPIO Output
Control Register is 1, all of the lines on the general-purpose port are con-
figured as inputs. If this bit is 0, all of the lines on the general-purpose
port are configured as outputs. Table 7 lists the multiple functions of the
register.
Table 6. LED and Port Emulation Addresses
Address Register Function Access
800000h LED Anode/General-Purpose Port
Output Control WR
800001h LED Cathode/Modem/Trig WR
800002h General-Purpose Port Data RD/WR
Table 7. LED Anode/General-Purpose Port 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