Types Of Interrupt Sources And Vector Table - NEC PD754144 User Manual

7.2 Types of Interrupt Sources and Vector Table

The µ PD754244 has the following six interrupt sources and nesting of interrupts can be controlled by software.
Interrupt Source
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)
Note If two or more interrupts occur at the same time, the interrupts are processed according to this priority.
188
CHAPTER 7 INTERRUPT AND TEST FUNCTIONS
Table 7-1. Types of Interrupt Sources
Internal/External
Internal
External
Internal
Internal
Internal
Internal
User's Manual U10676EJ3V0UM
Vectored Interrupt Request Signal
Interrupt
Note
(Vector Table Address)
Priority
1 VRQ1 (0002H)
2 VRQ2 (0004H)
3 VRQ5 (000AH)
4 VRQ6 (000CH)
5 VRQ7 (000EH)