MC9S08GB32 Motorola, MC9S08GB32 Datasheet - Page 68
MC9S08GB32
Manufacturer Part Number
MC9S08GB32
Description
Microcontrollers
Manufacturer
Motorola
Datasheet
1.MC9S08GB32.pdf
(290 pages)
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Chapter 5 Resets, Interrupts, and System Configuration
When using the external oscillator in stop3 mode, it must be enabled in stop (OSCSTEN = 1) and
configured for low bandwidth operation (RANGE = 0).
The SRTISC register includes a read-only status flag, a write-only acknowledge bit, and a 3-bit control
value (RTIS2:RTIS1:RTIS0) used to select one of seven RTI periods. The RTI has a local interrupt enable,
RTIE, to allow masking of the real-time interrupt. The module can be disabled by writing 0:0:0 to
RTIS2:RTIS1:RTIS0 in which case the clock source input is disabled and no interrupts will be generated.
See
information about this register.
5.8
One 8-bit register in the direct page register space and eight 8-bit registers in the high-page register space
are related to reset and interrupt systems.
Refer to the direct-page register summary in
address assignments for all registers. This section refers to registers and control bits only by their names.
A Freescale-provided equate or header file is used to translate these names into the appropriate absolute
addresses.
Some control bits in the SOPT and SPMSC2 registers are related to modes of operation. Although brief
descriptions of these bits are provided here, the related functions are discussed in greater detail in
Chapter 3, “Modes of
5.8.1
This direct page register includes two unimplemented bits which always read 0, four read/write bits, one
read-only status bit, and one write-only bit. These bits are used to configure the IRQ function, report status,
and acknowledge IRQ events.
IRQEDG — Interrupt Request (IRQ) Edge Select
68
This read/write control bit is used to select the polarity of edges or levels on the IRQ pin that cause
IRQF to be set. The IRQMOD control bit determines whether the IRQ pin is sensitive to both edges
and levels or only edges. When the IRQ pin is enabled as the IRQ input and is configured to detect
rising edges, the optional pullup resistor is re-configured as an optional pulldown resistor.
Section 5.8.6, “System Real-Time Interrupt Status and Control Register
1 = IRQ is rising edge or rising edge/high-level sensitive.
0 = IRQ is falling edge or falling edge/low-level sensitive.
Reset, Interrupt, and System Control Registers and Control Bits
Interrupt Pin Request Status and Control Register (IRQSC)
Figure 5-2. Interrupt Request Status and Control Register (IRQSC)
Reset:
Read:
Write:
Operation.”
Bit 7
0
0
= Unimplemented or Reserved
MC9S08GB/GT Data Sheet, Rev. 2.3
6
0
0
Chapter 4,
IRQEDG
5
0
IRQPE
“Memory,” of this data sheet for the absolute
4
0
IRQF
3
0
IRQACK
2
0
0
(SRTISC),”
IRQIE
Freescale Semiconductor
1
0
for detailed
IRQMOD
Bit 0
0
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