MC68HC11PH8 Datasheet, PDF (84/264 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

4.5
Port E
Port E is an 8-bit input-only port. In addition to their input capability, port E pins are shared with
A/D functions, as shown in the following table.
Pin
Alternate
function
4
PE0
AD0

PE1
AD1


PE2
AD2


PE3
AD3


See Section 9 for
PE4
AD4
 _{more information.}

PE5
AD5


PE6
AD6


PE7
AD7

On reset the pins are configured as general purpose high-impedance inputs.
4.5.1 PORTE — Port E data register
Port E data (PORTE)
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
$000A PE7 PE6 PE5 PE4 PE3 PE2 PE1 PE0 undeÞned
This is a read-only register and is not affected by reset. The bits may be read at any time.
Note:
As port E shares pins with the A/D converter, a read of this register may affect any
conversion currently in progress, if it coincides with the sample portion of the
conversion cycle. Hence, normally port E should not be read during the sample portion
of any conversion.
MOTOROLA
4-6
PARALLEL INPUT/OUTPUT
TPG
MC68HC11PH8