Specifications

Contents
TCKS - Counter/Timer Clock Selection Register ................ 6-10
RESET
......................................................... 6-12
Chapter 7. COUNTER/TIMERS (V40) 7-1
OVERVIEW
..................................................... 7-2
ZT 8832 SPECIFICS
............................................. 7-3
FUNCTIONAL DESCRIPTION
................................... 7-4
Read/Write Control
........................................... 7-4
Mode Register
............................................... 7-5
Clock Select and Divisor
...................................... 7-5
Counter/Timers 0, 1, and 2
.................................... 7-5
PROGRAMMABLE REGISTERS
................................. 7-7
Timer Mode Register (TMD)
.................................. 7-8
Count Registers
............................................. 7-12
Status Registers
............................................. 7-12
OPERATION
................................................... 7-14
Reset
...................................................... 7-14
Count Latch Command
...................................... 7-14
Multiple Latch Command
.................................... 7-15
Modes of Operation
......................................... 7-16
Programming
............................................... 7-28
Chapter 8. INTERRUPT CONTROLLER (V40) 8-1
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