MC9S12E32CFU FREESCALE [Freescale Semiconductor, Inc], MC9S12E32CFU Datasheet - Page 533

• Manufacturer Part Number: MC9S12E32CFU
• Description: HCS12 Microcontrollers
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

18.3.2.13 Reserved Register
This register location is not used (reserved). All bits in this register return logic 0s when read. Writes to
this register have no effect.
This register is not in the on-chip memory map in expanded and special peripheral modes. Therefore, these
accesses will be echoed externally.
18.3.2.14 IRQ Control Register (IRQCR)
Read: See individual bit descriptions below
Write: See individual bit descriptions below
Freescale Semiconductor
IRQEN
Field
IRQE
7
6
Reset
Reset
W
W
R
R
IRQ Select Edge Sensitive Only
Special modes: read or write anytime
Normal and Emulation modes: read anytime, write once
0 IRQ configured for low level recognition.
1 IRQ configured to respond only to falling edges. Falling edges on the IRQ pin will be detected anytime
External IRQ Enable
Normal, emulation, and special modes: read or write anytime
0 External IRQ pin is disconnected from interrupt logic.
1 External IRQ pin is connected to interrupt logic.
Note: When IRQEN = 0, the edge detect latch is disabled.
IRQE = 1 and will be cleared only upon a reset or the servicing of the IRQ interrupt.
IRQE
7
0
0
7
0
= Unimplemented or Reserved
= Unimplemented or Reserved
IRQEN
6
0
0
6
1
Figure 18-18. IRQ Control Register (IRQCR)
Table 18-12. IRQCR Field Descriptions
Figure 18-17. Reserved Register
MC9S12E128 Data Sheet, Rev. 1.07
5
0
0
5
0
0
0
0
0
0
Description
4
4
Chapter 18 Multiplexed External Bus Interface (MEBIV3)
0
0
0
0
3
3
0
0
0
0
2
2
0
0
0
0
1
1
0
0
0
0
0
0
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