eorex

EU1010

Feb.2009

www.eorex.com

interrupt will have two kinds of time duties based on T1BF0 and T1BF1 data.

I/O ports

PA ports (PA0, PA1, PA4 and PA5) are 4-bits I/O ports. System can either output data by writing data

into PA(10H) ports or read data from input mode by reading PA(10H) ports.

When PA ports are set in output mode, it can be optioned by software as CMOS or NMOS output. Set in

input mode, PA ports can be optioned as internal pull up or input with floating status. Also, PA6~0 could

be optioned as A/D converter analog signal input pins. Please refer to

Address

10H

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

Name

PA

#

#

1/0

1/0

#

#

1/0

1/0

Default Value

#

#

#

#

#

#

#

#

PAIO register: control PA port either as input mode or output mode. PAIO register can be set partially bits

in input mode and partial bits in output mode.

Address

11H

bit7

bit6

bit5

bit4

bit3

bit2

bit1

bit0

Name

PAIO

#

#

1/0

1/0

#

#

1/0

1/0

Default Value

#

#

1

1

#

#

1

1

Note:

*PAIO.n = 1, set as input mode.

(Please be noted that PAIO.0 default data is “0”.)

PAIO.n = 0, set as output mode.

That n = 0, 1, 4 and 5.

PACN register: control output mode as CMOS or NMOS output.

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