MC68HC11PH8 Datasheet, PDF (88/264 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

4.8.3 Wired-OR interrupt
4.8.3.1 WOIEH — WOI enable (WOIEH)
Address bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
State
on reset
Wired-OR interrupt enable (WOIEH) $007B IEH7 IEH6 IEH5 IEH4 IEH3 IEH2 IEH1 IEH0 0000 0000
4
IEHx — Port H pin x wired-OR interrupt enable
1 (set) – PHx wired-OR interrupt enabled.
0 (clear) – PHx wired-OR interrupt disabled.
With the wired-OR interrupt function enabled, any port H pin configured as an input may be used
as a keyboard interrupt. A high to low transition on an enabled pin (with all other enabled pins high)
will result in an interrupt. The wired-OR interrupt flag (bit 4 of the port pull-up assignment register)
indicates that an interrupt has occurred (see Section 4.9.1). A wired-OR interrupt can wake the
MCU from STOP or WAIT mode.
MOTOROLA
4-10
PARALLEL INPUT/OUTPUT
TPG
MC68HC11PH8