43 / 132 page
HT80C51 User Manual
Peripheral Modules – General Purpose IOs
Handshake Solutions
© Philips Electronics N.V. 2005
Page 43 of 132
POUT3
Output Port 3
addr = B0
(configurable)
reset value = FFH
bits
7
6
5
4
3
2
1
0
POUT3
bit
symbol
Function
POUT3.7
..
POUT3.0
set the output values of output pins gpio_pout3_o[7:0]
POUTx
Output Port x, x>3
addr =
(configurable)
reset value = FFH
bits
7
6
5
4
3
2
1
0
POUTx
bit
symbol
Function
POUTx.7
..
POUTx.0
set the output values of output pins gpio_poutx_o[7:0]
PINx
Input Port x
addr =
(configurable)
reset value =
not applicable
bits
7
6
5
4
3
2
1
0
PINx
bit
symbol
Function
PINx.7 ..
PINx.0
Read the values of input pins gpio_pinx_o[7:0].
Write accesses have no effect.
5.4.3.
Interrupts
No interrupts are generated.
5.4.4.
Operation
Write accesses to output ports directly set the related output pins. There is no synchronization to any
external clocks done. Read accesses to output ports return the contents of the output latches.
Read accesses to input port return the values that are applied to their related input pins. Write ac-
cesses to an input port have no effect.
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