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MCU Resets, Interrupts, and System Configuration
MC1321x Reference Manual, Rev. 1.6
Freescale Semiconductor
12-5
12.5.2.1
Pin Configuration Options
The IRQ pin enable (IRQPE) control bit in the IRQSC register must be 1 for the IRQ pin to act as the
interrupt request (IRQ) input. When the pin is configured as an IRQ input, the user can choose the polarity
of edges or levels detected (IRQEDG), whether the pin detects edges-only or edges and levels (IRQMOD),
and whether an event causes an interrupt or only sets the IRQF flag (which can be polled by software).
When the IRQ pin is configured to detect rising edges, an optional pull-down resistor is available rather
than a pullup resistor. BIH and BIL instructions may be used to detect the level on the IRQ pin when the
pin is configured to act as the IRQ input.
NOTE
The voltage measured on the pulled up IRQ pin may be as low as V
DD
– 0.7
V. The internal gates connected to this pin are pulled all the way to V
DD
. All
other pins with enabled pullup resistors will have an unloaded measurement
of V
DD
.
Table 12-1. Vector Summary
Vector
Priority
Vector
Number
Address
(High/Low)
Vector Name
Module
Source
Enable
Description
Lower
26
through
31
$FFC0/FFC1
through
$FFCA/FFCB
Unused Vector Space
(available for user program)
25
$FFCC/FFCD
Vrti System
control
RTIF
RTIE
Real-time interrupt
24
$FFCE/FFCF
Viic1 IIC
IICIS
IICIE
IIC
control
23
$FFD0/FFD1
Vatd1
ATD
COCO
AIEN
AD conversion
complete
22
$FFD2/FFD3
Vkeyboard1 KBI
KBF
KBIE
Keyboard
pins
21
$FFD4/FFD5
Vsci2tx SCI2
TDRE
TC
TIE
TCIE
SCI2 transmit
20
$FFD6/FFD7
Vsci2rx
SCI2
IDLE
RDRF
ILIE
RIE
SCI2 receive
19
$FFD8/FFD9
Vsci2err SCI2
OR
NF
FE
PF
ORIE
NFIE
FEIE
PFIE
SCI2 error
18
$FFDA/FFDB
Vsci1tx SCI1
TDRE
TC
TIE
TCIE
SCI1 transmit
17
$FFDC/FFDD
Vsci1rx SCI1
IDLE
RDRF
ILIE
RIE
SCI1 receive
16
$FFDE/FFDF
Vsci1err SCI1
OR
NF
FE
PF
ORIE
NFIE
FEIE
PFIE
SCI1 error
Summary of Contents for freescale semiconductor MC13211
Page 40: ...MC1321x Pins and Connections MC1321x Reference Manual Rev 1 6 2 6 Freescale Semiconductor...
Page 166: ...Modem Modes of Operation MC1321x Reference Manual Rev 1 6 7 22 Freescale Semiconductor...
Page 172: ...Modem Interrupt Description MC1321x Reference Manual Rev 1 6 8 6 Freescale Semiconductor...
Page 186: ...MCU Modes of Operation MC1321x Reference Manual Rev 1 6 10 8 Freescale Semiconductor...
Page 208: ...MCU Memory MC1321x Reference Manual Rev 1 6 11 22 Freescale Semiconductor...
Page 244: ...MCU Parallel Input Output MC1321x Reference Manual Rev 1 6 13 20 Freescale Semiconductor...
Page 288: ...MCU Central Processor Unit CPU MC1321x Reference Manual Rev 1 6 15 20 Freescale Semiconductor...
Page 308: ...MCU Timer PWM TPM Module MC1321x Reference Manual Rev 1 6 17 16 Freescale Semiconductor...
Page 338: ...Inter Integrated Circuit IIC MC1321x Reference Manual Rev 1 6 19 14 Freescale Semiconductor...
Page 372: ...Development Support MC1321x Reference Manual Rev 1 6 21 20 Freescale Semiconductor...