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MB90560 series
CHAPTER 14 DTP/EXTERNAL INTERRUPT CIRCUIT
G
Switching between the external interrupt function and the DTP function
Switching between the external interrupt function and the DTP function is accomplished by the
ISE bit of the corresponding interrupt control register (ICR). If the ISE bit is 1, the extended
intelligent I/O service (EI
2
OS) is enabled and the circuit executes its DTP function. If it is “0”,
EI
2
OS is disabled and the circuit executes the its external interrupt function.
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If multiple interrupt requests are assigned to a single ICR register, the interrupt level (IL2 to
IL0) is common to all of the interrupt requests. As a rule, when one interrupt request uses
EI
2
OS, the other interrupt requests cannot use it.
I
Operation of the DTP/external interrupt circuit
Table 14.5-1 shows the control bits and interrupt causes of the DTP/external interrupt circuit.
Table 14.5-1 Control bit and interrupt cause of the DTP/external interrupt circuit
When DTP/external input requests are set, an interrupt request will be generated to the interrupt
controller whenever an interrupt cause indicated in the request level setting register (ELVR) is
received at the corresponding pin. If the ISE bit is “0”, the interrupt processing microprogram is
executed. If it is “1”, the extended intelligent I/O service handling (DTP handling) microprogram
is executed.
DTP/external interrupt circuit
Interrupt request flag bit
EIRR: ER7 to ER0
Interrupt request enable bit
ENIR: EN7 to EN0
Interrupt cause
Input of an effective edge or level to pin INT7 to INT0