Zilog EZ80F91 Bedienungsanleitung PDF herunterladen (Seite 28)

eZ80F91 Development Kit

User Manual

UM014220-0508 eZ80 Development Kit

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 #

76543210

Anode Col 1 X

Anode Col 2 X

Anode Col 3 X

Anode Col 4 X

Anode Col 5 X

Anode Col 6 X

GPIO Output X

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 77 78

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