EM78468AQ EMC [ELAN Microelectronics Corp], EM78468AQ Datasheet - Page 45

• Manufacturer Part Number: EM78468AQ
• Description: 8-BIT Microcontroller
• Manufacturer: EMC [ELAN Microelectronics Corp]

Product Specification (V1.1) 04.11.2005
(This specification is subject to change without further notice)
With this LSI, each individual interrupt source has its own interrupt vector as depicted in
Table 3. Before the interrupt subroutine is executed, the contents of ACC and the R3
register are initially saved by hardware. After the interrupt service routine is completed,
ACC and R3 are restored. The existing interrupt service routine does not allow other
interrupt service routine to be executed. So if other interrupts occur while the existing
interrupt service routine is being executed, the hardware will save the later interrupts.
Only after the existing interrupt service routine is completed that the next interrupt
service routine is executed.
Table 3 Interrupt Vector
Interrupt Vector
Interrupt Source
000CH
ENI/ DISI
000FH
0003H
0006H
0009H
0012H
0015H
0018H
TCC overflow interrupt.
External interrupt P5.4/INT0 pin
External interrupt P5.5/INT1 pin
Counter 1 underflow interrupt
Counter 2 underflow interrupt
High-pulse width timer underflow interrupt
Low-pulse width timer underflow interrupt
PORT 6, PORT 8 input status change wake-up
Fig. 15. Interrupt Backup Diagram
Interrupt Status
ACC
R3
Interrupt Occur
RETI
8-BIT Microcontroller
STACKACC
STACKR3
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