Filter
Top Products
314
CHAPTER 17 DTP/EXTERNAL INTERRUPTS
17.1 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
EI
2
OS.
■ DTP/External Interrupt Function
The DTP/external interrupt follows the same procedure as resource interrupts to send interrupt requests
from external peripheral devices to the CPU to generate an external interrupt request, or starts the EI
2
OS.
If the EI
2
OS is disabled in the interrupt control register (ICR: ISE=0), the external interrupt function is
enabled, branching to interrupt processing.
If the EI
2
OS is enabled, the DTP function is enabled and automatic data transfer is performed, branching to
interrupt processing after the completion of data transfer for the specified number of times.
Table 17.1-1 shows an overview of the DTP/external interrupt.
Table 17.1-1 Overview of DTP/External Interrupt
External Interrupt DTP Function
Input pin 8 pins : INT8, INT9R, INT10, INT11, INT12R, INT13, INT14R, INT15R
Interrupt factor
The interrupt factor is set in unit of pins using the detection level setting registers
(ELVR1).
Input of High level, Low level, rising
edge, or falling edge
Input of High level or Low level
Interrupt number #26(1A
H
), #28(1C
H
)
Interrupt control The interrupt request output is enabled/disabled using the DTP/external interrupt
enable register (ENIR1).
Interrupt flag The interrupt factor is held using the DTP/external interrupt factor register (EIRR1).
Processing
selection
The EI
2
OS is disabled. (ICR: ISE=0) The EI
2
OS is enabled. (ICR: ISE=1)
Processing
contents
A branch is caused to the external
interrupt processing routine.
EI
2
OS performs automatic data transfer
and completes the specified number of
time for data transfers, causing a branch
to the interrupt processing.