GENERAL RELEASE SPECIFICATION
August 27, 1998
read of the TSR with the TOF flag bit set; and then followed by an access to the
LSB of the timer registers (TMRL) or by reset. The TOIE enable bit is unaffected
by reset.
4.7
4.8
SM-BUS INTERRUPT
There is one SM-Bus interrupt flag that causes SM-Bus interrupt whenever it is
set and enabled. The interrupt flags is in the SM-Bus Status Register (SMSR) and
the enable bit is in SM-Bus Control Register (SMCR). SM-Bus interrupt can wake
up MCU from WAIT mode.
ANALOG INTERRUPTS
The analog subsystem can generate the following interrupts:
•
Voltage on positive input of comparator is greater than the voltage on the
negative input of comparator.
•
Trigger of the input capture interrupt from the programmable Timer as
described in Section 4.6 above.
Setting the I bit in the condition code register disables analog subsystem inter-
rupts. The controls for these interrupts are in the analog subsystem control regis-
ter (ACR) located at $001D and the status bits are in the analog subsystem status
register (ASR) located at $001E.
4.8.1 Comparator Input Match Interrupt
A comparator input match interrupt occurs if the compare flag bit (CPF) in the
ASR becomes set while the comparator interrupt enable bit (CPIE) in the ACR is
also set. Reset clears these bits.
4.8.2 Input Capture Interrupt
The analog subsystem can also generate an input capture interrupt through the
programmable Timer. The input capture can be triggered when there is a match in
the input conditions for the voltage comparator. If comparator sets the CPF flag bit
in the ASR and the input capture enable (ICEN) in the ACR is set then an input
capture will be performed by the programmable Timer. If the ICIE enable bit in the
TCR is also set then an input compare interrupt will occur. Reset clears these bits.
NOTE
In order for the analog subsystem to generate an interrupt using the input capture
function of the programmable Timer the ICEN enable bit in the ACR and the ICIE
enable bit in the TCR must both be set.
4.9
CURRENT DETECT INTERRUPT
The Current Sense Amplifier circuit can be configured to generate an interrupt
once it detects a current passing through the current sensing resistor.
MOTOROLA
4-8
INTERRUPTS
MC68HC05SB7
REV 2.1
FREESCALE [ Freescale ]
