MC68HC705C9A_1 Datasheet, PDF (23/157 Pages) Freescale Semiconductor, Inc – General Release Specification

Freescale Semiconductor, Inc.
General Release Specification
Mask Options
1.5.2 C12 Mask Option Register (C12MOR)
The C12MOR register, shown in Figure 1-3, controls the following
options:
• Select between MC68HC05C9A/C12A configuration
• Enable/disable stop mode (C12A mode only)
• Enable/disable COP (C12A mode only)
• Edge-triggered only or edge- and level-triggered external interrupt
pin (IRQ pin) (C12A mode only).
$3FF1 Bit 7
6
5
4
3
2
1
Bit 0
Read: SEC
C12COPE STOPDIS C12IRQ C12A
= Unimplemented
Figure 1-3. Mask Option Register 2
C12A — C12A/C9A Mode Select
This read/write bit selects between C12A configuration and C9A
configuration.
1 = Configured to emulate MC68HC05C12A
0 = Configured to emulate MC68HC05C9A
C12IRQ — C12A Interrupt Request
This read/write bit selects between an edge-triggered only or edge-
and level-triggered external interrupt pin. If configured in C9A mode,
this bit has no effect and will be forced to zero regardless of the
programmed state.
1 = Edge and level interrupt option selected
0 = Edge-only interrupt option selected
NOTE: Any Port B pin configured for interrupt capability will follow the same
edge or edge/level trigger as the IRQ pin.
MC68HC705C9A — Rev. 2.0
General Description
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