Specifications

Contents
Objectives .................................................. 4-18
Program Code
.............................................. 4-19
Chapter 5. PROCESSOR DESCRIPTION (V40) 5-1
OVERVIEW
..................................................... 5-2
ZT 8832 SPECIFICS
............................................. 5-2
COMMONLY ASKED QUESTIONS
.............................. 5-3
FUNCTIONAL BLOCKS
......................................... 5-5
CPU - Central Processing Unit
................................. 5-6
BIU - Bus Interface Unit
..................................... 5-19
BAU - Bus Arbitration Unit
.................................. 5-19
CGU - Clock Generator Unit
................................. 5-20
VCR - V40 Configuration Registers
........................... 5-20
WCU - Wait Control Unit
.................................... 5-21
SCU - Serial Control Unit
.................................... 5-21
TCU - Counter/Timer Control Unit
............................ 5-21
ICU - Interrupt Control Unit
.................................. 5-22
DCU - DMA Control Unit
.................................... 5-22
RESET
......................................................... 5-23
MEMORY AND I/O ADDRESSING
.............................. 5-24
INTERRUPTS
.................................................. 5-27
Divide Error
................................................ 5-31
Single-Step
................................................. 5-31
Non-Maskable
.............................................. 5-32
Fixed Vector Instruction
...................................... 5-32
Overflow
................................................... 5-32
Check Index
................................................ 5-33
Variable Vector Instruction
................................... 5-33
Emulation Mode
............................................ 5-33
8080 EMULATION
............................................. 5-34
Chapter 6. PROCESSOR CONFIGURATION (V40) 6-1
OVERVIEW
..................................................... 6-1
VCR - V40 CONFIGURATION REGISTERS
....................... 6-2
OPCN - On Chip Peripheral Connection Register
................ 6-3
OPSEL - On Chip Peripheral Selection Register
................. 6-4
OPHA, DULA, IULA, TULA, and SULA
....................... 6-5
WCY2 - Wait Cycle 2 Register
................................. 6-7
WCY1 - Wait Cycle 1 Register
................................. 6-7
WMB - Wait Memory Boundary Register
....................... 6-9
RFC - Refresh Control Register
............................... 6-10