mc9s12xd256 Freescale Semiconductor, Inc, mc9s12xd256 Datasheet - Page 999

• Manufacturer Part Number: mc9s12xd256
• Description: Hcs12x Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

IRQEN
Reset
Reset
IRQE
24.0.5.10 IRQ Control Register (IRQCR)
Read: See individual bit descriptions below.
Write: See individual bit descriptions below.
Field
24.0.5.11 Port K Data Register (PORTK)
Read: Anytime.
Write: Anytime.
7
6
W
W
R
R
IRQE
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
Read or write anytime.
0 External IRQ pin is disconnected from interrupt logic.
1 External IRQ pin is connected to interrupt logic.
PK7
7
0
7
0
IRQE = 1 and will be cleared only upon a reset or the servicing of the IRQ interrupt.
= Unimplemented or Reserved
IRQEN
1
0
0
6
6
EDIV[1:0]
Table 24-13. Free-Running ECLK Clock Rate
Figure 24-13. Port K Data Register (PORTK)
Figure 24-12. IRQ Control Register (IRQCR)
00
01
10
11
Table 24-14. IRQCR Field Descriptions
PK5
5
0
0
5
0
ECLK = Bus clock rate
ECLK = Bus clock rate divided by 2
ECLK = Bus clock rate divided by 3
ECLK = Bus clock rate divided by 4
Rate of Free-Running ECLK
PK4
0
0
0
4
4
Description
PK3
3
0
0
3
0
PK2
0
0
0
2
2
PK1
1
0
0
1
0
PK0
0
0
0
0
0