Z8F042ASJ020EG2156 Datasheet, PDF (71/280 Pages) Zilog, Inc. – High-Performance 8-Bit Microcontrollers

Z8 Encore! XP^® F082A Series
Product Specification
55
GPIO Mode Interrupt Controller
The interrupt controller on the Z8 Encore! XP F082A Series products prioritizes the inter-
rupt requests from the on-chip peripherals and the GPIO port pins. The features of inter-
rupt controller include:
• 20 possible interrupt sources with 18 unique interrupt vectors:
– Twelve GPIO port pin interrupt sources (two interrupt vectors are shared)
– Eight on-chip peripheral interrupt sources (two interrupt vectors are shared)
• Flexible GPIO interrupts:
– Eight selectable rising and falling edge GPIO interrupts
– Four dual-edge interrupts
• Three levels of individually programmable interrupt priority
• Watchdog Timer and LVD can be configured to generate an interrupt
• Supports vectored and polled interrupts
Interrupt requests (IRQs) allow peripheral devices to suspend CPU operation in an orderly
manner and force the CPU to start an interrupt service routine (ISR). Usually this interrupt
service routine is involved with the exchange of data, status information, or control infor-
mation between the CPU and the interrupting peripheral. When the service routine is com-
pleted, the CPU returns to the operation from which it was interrupted.
The eZ8 CPU supports both vectored and polled interrupt handling. For polled interrupts,
the interrupt controller has no effect on operation. For more information about interrupt
servicing by the eZ8 CPU, refer to the eZ8 CPU Core User Manual (UM0128), which is
available for download on www.zilog.com.
Interrupt Vector Listing
Table 34 lists all of the interrupts available in order of priority. The interrupt vector is
stored with the most-significant byte (MSB) at the even Program Memory address and the
least-significant byte (LSB) at the following odd Program Memory address.
Note: Some port interrupts are not available on the 8- and 20-pin packages. The ADC interrupt is
unavailable on devices not containing an ADC.
PS022828-0413
PRELIMINARY
GPIO Mode Interrupt Controller