Datasheet

Bus Control and Input/Output
Registers
MC9S12DP256 — Revision 1.1
Bus Control and Input/Output
NOACCE — CPU No Access Output Enable
Normal: write once
Emulation: write never
Special: write anytime
1 = The associated pin (Port E bit 7) is output and indicates
whether the cycle is a CPU free cycle.
0 = The associated pin (Port E bit 7) is general purpose I/O.
This bit has no effect in single chip or peripheral modes.
PIPOE — Pipe Status Signal Output Enable
Normal: write once
Emulation: write never
Special: write anytime.
1 = The associated pins (Port E bits 6:5) are outputs and indicate
the state of the instruction queue
0 = The associated pins (Port E bits 6:5) are general purpose I/O.
This bit has no effect in single chip or peripheral modes.
NECLK — No External E Clock
Normal and Special: write anytime
Emulation: write never
1 = The associated pin (Port E bit 4) is a general purpose I/O pin.
0 = The associated pin (Port E bit 4) is the external E clock pin.
External E clock is free-running if ESTR=0.
External E clock is available as an output in all modes.
Freescale Semiconductor, I
Freescale Semiconductor, Inc.
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