Specifications

Chapter 8
INTERRUPT CONTROLLER (V40)
Contents Page
OVERVIEW ..................................................... 8-2
ZT 8832 SPECIFICS
............................................. 8-3
FUNCTIONAL DESCRIPTION
................................... 8-4
Interrupt Request Register
..................................... 8-4
Interrupt Mask Register
....................................... 8-5
Priority Resolver
............................................. 8-5
Interrupt In-Service Register
................................... 8-5
Control Logic
................................................ 8-6
Read/Write Control Logic
..................................... 8-6
Initialization and Operation Registers
........................... 8-6
PROGRAMMABLE REGISTERS
................................. 8-7
Initialization Words (IIW1, IIW2, IIW3, and IIW4)
............... 8-8
Operation Words (IMKW, IPFW, and IMDW)
.................. 8-12
Status Words (IRQ, IIS, and IPOL)
............................ 8-16
OPERATION
................................................... 8-19
Reset
...................................................... 8-19
Interrupts
................................................... 8-19
Interrupt Vectors
............................................ 8-21
Interrupt Nesting
............................................ 8-22
Level- or Edge-Triggered
.................................... 8-25
Finish Interrupts
............................................. 8-26
Automatic Priority Rotation
.................................. 8-28
Specific Priority Rotation
.................................... 8-29
Interrupt Masking
........................................... 8-30
Interrupt Status
.............................................. 8-31
Programming
............................................... 8-31
8-1