MFC2000 datasheet(263/426 Pages) ETC

263 / 426 page

Hardware Description

MFC 2000 Multifunctional Peripheral Controller 2000

100723A

Conexant

13-5

13.2 GPO/GPI Signals

The MFC2000 also provides eight GPO lines (GPO[7:0]), which are multiplexed with printer and scanner motor

control signals.

GPO[3:0]

GPO[3:0] are multiplexed with the printer motor control lines on the

four pins PM[3:0]/GPO[3:0]. These pins are selected as GPO's when

bit 0 in the GPIOConfig1 register is set to 1, and are selected as

printer motor control lines when this bit is set to 0. When these pins

are selected as GPO's, the GPO[3:0] output values are controlled by

the lowest 4 bits in the VPMPattern register, and appear on the output

pins immediately.

GPO[7:4]

GPO[7:4] are multiplexed with the scanner motor control lines on the

four pins SM[3:0]/GPO[7:4]. These pins are selected as GPO's when

bit 1 in the GPIOConfig1 register is set to 1, and are selected as

scanner motor control lines when this bit is set to 0. When these pins

are selected as GPO's, the GPO[7:4] output values are controlled by

the lowest 4 bits in the SMPattern register, and appear on the output

pins immediately.

GPO[13:8]

If the PIO Interface is not enabled, the pins for PIODIR, BUSY, ACKn,

SLCTOUT, PE and FAULTn will become GPIO8-GPIO13 respectively.

These pins are selected as GPO function when bit8 of GPIOConfig2

GPO[13:8] data is controlled by bit 5-0 of GPOData register.

GPO[17:14]

GPO[17:14] are multiplexed with AO3, AE3, AO2 and AE2

respectively, in addition, GPO14 is multiplexed with SSTXD2 and

GPO15 is with SSSTA2. The multiplexing selection is controlled by bit

0 and bit 1 of the GPIOConfig2 register. When bit0 of the

GPIOConfig2 register is 1, the SSTXD2/SSSTA2 function is selected,

when bit 0 is 0 and bit 1 is 1, the GPO[17:14] function is enabled and

the output value of the GPO[17:14] is controlled by bit 9-6 of GPOData

GPIOConfig2 register must be 0.

GPI[3:0]

Four PIO Interface input pins can be used as GPI when PIO interface

is not used, the value on these GPI pins can be read from bit 15-12 of

the GPOData register.

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