ZiLOG Z8

Z8 Microcontrollers
Table of Contents ZiLOG
Chapter Title and Subsections Page
iv UM001601-0803
Chapter 3. Clock (Continued)
Oscillator Operation .................................................................................................................... 3-3
Layout .................................................................................................................................. 3-3
Indications of an Unreliable Design ..................................................................................... 3-3
Circuit Board Design Rules .................................................................................................. 3-4
Crystals and Resonators ...................................................................................................... 3-5
LC Oscillator ............................................................................................................................... 3-6
RC Oscillator .............................................................................................................................. 3-6
Chapter 4. Reset—Watch-Dog Timer
Reset .......................................................................................................................................... 4-1
Reset Pin, Internal POR Operation ............................................................................................ 4-1
Watch-Dog Timer (WDT) ............................................................................................................ 4-7
Power-On-Reset (POR) .............................................................................................................. 4-8
Chapter 5. I/O Ports
I/O Ports ..................................................................................................................................... 5-1
Mode Registers .................................................................................................................... 5-1
Input and Output Registers .................................................................................................. 5-1
Port 0 .......................................................................................................................................... 5-2
General I/O Mode ................................................................................................................ 5-3
Read/Write Operations ........................................................................................................ 5-4
Handshake Operation .......................................................................................................... 5-4
Port 1 .......................................................................................................................................... 5-5
General I/O Mode ................................................................................................................ 5-5
Read/Write Operations ........................................................................................................ 5-8
Handshake Operations ........................................................................................................ 5-8
PORT 2 ....................................................................................................................................... 5-9
General Port I/O ................................................................................................................... 5-9
Read/Write Operations ...................................................................................................... 5-12
Handshake Operation ........................................................................................................ 5-12
PORT 3 ..................................................................................................................................... 5-13
General Port I/O ................................................................................................................. 5-13
Read/Write Operations ...................................................................................................... 5-18
Special Functions ............................................................................................................... 5-18
Port Handshake ........................................................................................................................ 5-19
I/O Port Reset Conditions ......................................................................................................... 5-24
Full Reset ........................................................................................................................... 5-24
Chapter 5. I/O Ports
Analog Comparators ................................................................................................................. 5-26