Resets, Interrupts, and System Conguration
MC9S08RC/RD/RE/RG Data Sheet, Rev. 1.11
62
Freescale Semiconductor
5.6
Low-Voltage Detect (LVD) System
The MC9S08RC/RD/RE/RG includes a system to protect against low-voltage conditions in order to
protect memory contents and control MCU system states during supply voltage variations. The system is
comprised of a power-on reset (POR) circuit, an LVD circuit with ag bits for warning and detection, and
a mechanism for entering a system safe state following an LVD interrupt. The LVD circuit can be
congured to generate an interrupt or a reset when low supply voltage has been detected.
Table 5-1. Vector Summary
Vector
Priority
Vector
Number
Address
(High/Low)
Vector Name
Module
Source
Enable
Description
Lower
Higher
16
through
31
$FFC0/FFC1
through
$FFDE/FFDF
Unused Vector Space
(available for user program)
15
$FFE0/FFE1
Vspi1
SPI(1)
1. The SPI module is not included on the MC9S08RC/RD/RE devices. This vector location is unused for those devices.
SPIF
MODF
SPTEF
SPIE
SPTIE
SPI
14
$FFE2/FFE3
Vrti
System
control
RTIF
RTIE
Real-time interrupt
13
$FFE4/FFE5
Vkeyboard2
KBI2
KBF
KBIE
Keyboard 2 pins
12
$FFE6/FFE7
Vkeyboard1
KBI1
KBF
KBIE
Keyboard 1 pins
11
$FFE8/FFE9
Vacmp1
ACMP(2)
2. The analog comparator (ACMP) module is not included on the MC9S08RD devices. This vector location is unused for those
devices.
ACF
ACIE
ACMP compare
10
$FFEA/FFEB
Vcmt
CMT
EOCF
EOCIE
CMT
9
$FFEC/FFED
Vsci1tx
SCI(3)
3. The SCI module is not included on the MC9S08RC devices. This vector location is unused for those devices.
TDRE
TC
TIE
TCIE
SCI transmit
8
$FFEE/FFEF
Vsci1rx
SCI(3)
IDLE
RDRF
ILIE
RIE
SCI receive
7
$FFF0/FFF1
Vsci1err
SCI(3)
OR
NF
FE
PF
ORIE
NFIE
FEIE
PFIE
SCI error
6
$FFF2/FFF3
Vtpm1ovf
TPM
TOF
TOIE
TPM overow
5
$FFF4/FFF5
Vtpm1ch1
TPM
CH1F
CH1IE
TPM channel 1
4
$FFF6/FFF7
Vtpm1ch0
TPM
CH0F
CH0IE
TPM channel 0
3
$FFF8/FFF9
Virq
IRQ
IRQF
IRQIE
IRQ pin
2
$FFFA/FFFB
Vlvd
System
control
LVDF
LVDIE
Low-voltage detect
1
$FFFC/FFFD
Vswi
Core
SWI
Instruction
—
Software interrupt
0
$FFFE/FFFF
Vreset
System
control
COP
LVD
RESET pin
Illegal opcode
Illegal address
COPE
LVDRE
RSTPE
—
Watchdog timer
Low-voltage detect
External pin
Illegal opcode
Illegal address