2 types of interrupt sources and vector table – NEC PD754144 User Manual
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CHAPTER 7 INTERRUPT AND TEST FUNCTIONS
188
User’s Manual U10676EJ3V0UM
7.2 Types of Interrupt Sources and Vector Table
The
µPD754244 has the following six interrupt sources and nesting of interrupts can be controlled by software.
Table 7-1. Types of Interrupt Sources
Interrupt Source
Internal/External
Vectored Interrupt Request Signal
(Vector Table Address)
Interrupt
Priority
Note
INBT
(reference time interval signal from ba-
sic interval timer/watchdog timer)
INT0
(rising edge or falling edge is selected)
INTT0
(signal indicating match between count
register of timer counter 0 and modulo
register)
INTT1
(signal indicating match between count
register of timer counter 1 and modulo
register)
INTT2
(signal indicating match between count
register of timer counter 2 and modulo
register)
INTEE
(signal indicating writing of EEPROM
has ended)
Internal
1
VRQ1 (0002H)
External
2
VRQ2 (0004H)
Internal
3
VRQ5 (000AH)
Internal
4
VRQ6 (000CH)
Internal
Internal
5
VRQ7 (000EH)
Note If two or more interrupts occur at the same time, the interrupts are processed according to this priority.