Specifications

Contents
Chapter 4. APPLICATION EXAMPLES 4-1
OVERVIEW
..................................................... 4-2
EXAMPLE 1-A: USING SIMPLE INTERRUPTS
................... 4-3
Objectives
................................................... 4-3
System Configuration
......................................... 4-3
Software Outline
............................................. 4-4
Program Code
................................................ 4-6
EXAMPLE 1-B: HANDLING SLAVE INTERRUPTS
.............. 4-13
Objectives
.................................................. 4-13
System Configuration
........................................ 4-14
Software Outline
............................................ 4-14
Program Code
.............................................. 4-17
EXAMPLE 2: POWER-FAIL/WATCHDOG TIMER
................ 4-28
Objectives
.................................................. 4-28
System Level Issues
......................................... 4-28
System Requirements
........................................ 4-29
Software Outline
............................................ 4-31
Flowcharts For AC Power-Fail & Watchdog Interrupts
.......... 4-34
EXAMPLE 3: REAL-TIME CLOCK DRIVERS
.................... 4-40
Objectives
.................................................. 4-40
System Configuration
........................................ 4-40
Software Outline
............................................ 4-40
Chapter 5. MEMORY AND I/O CAPABILITY 5-1
OVERVIEW
..................................................... 5-1
MEMORY ADDRESSING
........................................ 5-2
Memory Expansion (MEMEX)
................................ 5-2
On-Board Memory Capacity
................................... 5-2
Write Protection
.............................................. 5-3
MEMORY MAPS
................................................ 5-4
BATTERY BACKUP
............................................ 5-10
MEMORY DEVICE LOCATIONS
................................ 5-11
Sockets 3D1 and 5D1
........................................ 5-12
Sockets 7D1 and 9D1
........................................ 5-13
DEVICE ACCESS TIMES
....................................... 5-14
INPUT/OUTPUT ADDRESSING
................................. 5-15
Chapter 6. CPU DESCRIPTION (V20) 6-1
V20 OVERVIEW
................................................ 6-2
Segment Registers
............................................ 6-3
Program Counter (PC) [IP]
.................................... 6-5