ZiLOG Z8

Table Of Contents (Continued)
9.4
9.5
Port 2
9.4.1 Read/Write Operations
9.4.2 Handshake Operation
Port 3
9.5.1
9.5.2
Read/Write Operations
Special Functions
9.6 Port Handshake •••••
9.7 I/O Port Reset Conditions.
Chapter 10. Interrupts
10.1 Introduction
10.2 Interrupt Sources •
10.2.1 External Interrupt Sources
10.2.2 Internal Interrupt Sources
10.3 Interrupt Request Register Logic and Timing •
10.4 Interrupt Initialization •••••
10.4.1
10.4.2
10.4.3
Interrupt Priority Register Initialization
Interrupt Mask Register Initialization
Interrupt Request Register Initialization •
10.5 IRQ Software Interrupt Generation • •
10.6 Vectored Processing •••••••
10.7
10.8
vi
10.6.1
10.6.2
Vectored Interrupt Cycle Timing
Nesting of Vectored Interrupts
Polled Processing
Reset Conditions
9-5
• 9-5
9-5
9-6
9-6
9-7
9-8
9-10
10-1
10-1
10-1
10-3
10-3
10-3
10-4
10-5
10-5
10-5
10-6
10-7
10-7
10-7
10-7
9
10