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CHAPTER 12 DTP/external interrupt
12.1
Overview of DTP/External Interrupt
The DTP/external interrupt sends interrupt requests from external peripheral devices or
data transfer requests to the CPU to generate an external interrupt request, or starts the
2
(EI
OS).RX input of CAN controller can be used as external interrupt input.
I DTP/External Interrupt Function
The interrupt request input from an external peripheral device to the external interrupt input pins (INT7 to
INT4) or RX pin is generated in the same way as interrupts by peripheral resources. It generates an external
interrupt or starts Extended Intelligent I/O service (EI
If the (EI
enabled, branching to interrupt processing.
If the EI
performed, branching to interrupt processing after the completion of data transfer for the specified number
of times.
Table 12.1-1 shows overview DTP/external interrupt.
Table 12.1-1 Overview of DTP/External Interrupt
Input Pin
Interrupt Factor
Interrupt
Number
Interrupt
Control
Interrupt flag
Processing
selection
Processing
contents
330
2
OS) is disabled in the interrupt control register (ICR: ISE = 0), the external interrupt function is
2
OS is enabled (ICR: ISE = 1), the DTP function is enabled and automatic data transfer is
External interrupt
5 pins (RX, INT4 to INT7)
The interrupt factor is set in unit of pins using the detection level setting registers.
Input of High level, Low level, rising
edge, or falling edge
#15 (0F
), #24 (18
H
The interrupt request output is enabled/disabled using the DTP/external interrupt
enable register (ENIR).
The interrupt factor is held using the DTP/external interrupt factor register (EIRR)
2
The EI
OS is disabled.
(ICR: ISE=0)
A branch is caused to the external
interrupt processing routine.
2
OS).
Input of High level or Low level
), #27 (1B
)
H
H
The EI
(ICR: ISE=1)
2
EI
OS performs auto data transfer and
completes the specified number of timer
for data transfers, causing a branch to
the interrupt processing.
DTP Function
2
OS is enabled.
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