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eZ80F92 Development Kit

User Manual

UM013911-0607 Operational Description

These functions are memory-mapped with an address decoder based on

the Generic Array Logic GAL22lV10D (U15) device manufactured by

Lattice Semiconductor, and a bidirectional latch (U16). Additionally, U15

is used to decode addresses for access to the 7 x 5 LED matrix.

Table 6 lists the memory map addresses to registers that allow access to

the above functions. The register at address

800000h controls GPIO Port

A 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 GPIO Port A

data.

Port A Emulation

GPIO Port A is emulated with the use of the GPIO Output Control Regis-

ter and the GPIO Data Register. If bit 7 in the GPIO Output Control Reg-

ister is 1, all of the lines on GPIO Port A are configured as input ports. If

this bit is 0, all of the lines on Port A are configured as output ports.

Table 7 lists the multiple functions of the register.

Table 6. 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 7. LED Anode/GPIO Port A Output Control Register

Function

Bit #

76543210

Anode Col 1 X

Anode Col 2 X

Anode Col 3 X

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 86 87

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