Zilog Z16C30 Manual do Utilizador descarregar pdf (Página 178)

8-23

Z16C30 USC

USER'S MANUAL

ZILOG

UM97USC0100

14 13 12 11 10 9 8 7 6 5 4 3 2 1 015

Interrupt Vector7-4 (RO)

Interrupt Vector Register (IVR) Register Address 0 b 01010

Bit(s)

Field/Bit

Name

Conditions

/Context

Description

Status

Ref Chapter: Section

IV0

(RO)

IVR15-12

Type Code (RO)

Interrupt Vector (RW)

Read as software wrote IVR7-4 RO 7: Interrupt Vectors

IVR11-9 highest pending interrupt type;

000=no interrupt type pending;

001=Misc;

101=I/O Pin;

011=Transmit Data;

100=Transmit Status;

101=Receive Data;

110=Receive Status

ROTypeCode

IVR15-8,

or IAck w/

highest

pending

type

enabled by

ICR12-9

IVR8 as software wrote IVR0 RO

IVR7-0 Read/Write

IVR7-0,

or IAck w/

highest

pending

type

blocked by

ICR12-9

basic 8-bit interrupt vector

(reads back as software wrote it)

RW = Read/Write, RO = Read Only, WO = Write Only – for other codes see p. 8-10.

UM009402-0201

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