Z8F082ASH020SC Datasheet, PDF (64/244 Pages) Zilog, Inc. – Z8 Encore XP-R F08xA Series with eXtended Peripherals

Z8 Encore! XP^® F08xA Series
Product Specification
46
Interrupt Controller
Overview
The interrupt controller on the XP 8K Series products prioritizes the interrupt requests
from the on-chip peripherals and the GPIO port pins. The features of the interrupt control-
ler include the following:
• 20 unique interrupt vectors:
– 14 GPIO port pin interrupt sources (two are shared)
– 10 on-chip peripheral interrupt sources (two are shared)
• Flexible GPIO interrupts
– 8 selectable rising and falling edge GPIO interrupts
– 4 dual-edge interrupts
• 3 levels of individually programmable interrupt priority
• Watch-Dog Timer and Low Voltage Detect (LVD) can be configured to generate an inter-
rupt
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. Refer to the eZ8 CPU User Manual for
more information regarding interrupt servicing by the eZ8 CPU. The eZ8 CPU User Man-
ual is available for download at www.zilog.com.
Interrupt Vector Listing
Note:
Table 31 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.
Some port interrupts are not available on the 8- and 20-pin packages. The ADC interrupt is
unavailable on devices not containing an ADC.
PS024705-0405
PRELIMINARY
Interrupt Controller