USB97C100 datasheet(21/64 Pages) SMSC

21 / 64 page

SMSC DS – USB97C100

Page 21

Rev. 01/03/2001

Table 23 - GPIO Direction Register

GPIOA_DIR

(0x7F18- RESET=0x00)

MCU UTILITY REGISTERS

BIT

NAME

R/W

DESCRIPTION

GPIO7

R/W

GPIO7 Direction

0 = In

1 = Out

GPIO6

R/W

GPIO6 Direction

0 = In

1 = Out

GPIO5

R/W

GPIO5 Direction

0 = In

1 = Out

GPIO4

R/W

GPIO4 Direction

0 = In

1 = Out

GPIO3/T1

R/W

GPIO3 Direction

0 = In

1 = Out

GPIO2/T0

R/W

GPIO2 Direction

0 = In

1 = Out

GPIO1/TXD

R/W

GPIO1 Direction

0 = In

1 = Out

GPIO0/RXD

R/W

GPIO0 Direction

0 = In

1 = Out

Note: The Timer inputs T[1:0] can be configured as outputs and left unconnected so that software can write to the

bits to trigger the timer. Otherwise, the Timer inputs can be used to count external events or internal SOF

receptions.

Table 24 - GPIO Output Register

GPIOA_OUT

(0x7F19- RESET=0x00)

GPIO DATA OUTPUT

BIT

NAME

R/W

DESCRIPTION

GPIO7

R/W

GPIO7 Output Buffer Data

GPIO6

R/W

GPIO6 Output Buffer Data

GPIO5

R/W

GPIO5 Output Buffer Data

GPIO4

R/W

GPIO4 Output Buffer Data

GPIO3/T1

R/W

GPIO3 Output Buffer Data

GPIO2/T0

R/W

GPIO2 Output Buffer Data

GPIO1/TXD

R/W

GPIO1 Output Buffer Data

GPIO0/RXD

R/W

GPIO0 Output Buffer Data

Table 25 - GPIO Input Register

GPIOA_IN

(0x7F1A- RESET=0xXX)

GPIO INPUT REGISTER A

BIT

NAME

R/W

DESCRIPTION

GPIO7

GPIO7 Input Buffer Data

GPIO6

GPIO6 Input Buffer Data

GPIO5

GPIO5 Input Buffer Data

GPIO4

GPIO4 Input Buffer Data

GPIO3/T1

GPIO3 Input Buffer Data

GPIO2/T0

GPIO2 Input Buffer Data

GPIO1/TXD

GPIO1 Input Buffer Data

GPIO0/RXD

GPIO0 Input Buffer Data

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