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Zilog Z16C30 User Manual

Page 178

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8-23

Z16C30 USC

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SER

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S

M

ANUAL

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ILOG

UM97USC0100

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

15

Interrupt Vector7-4 (RO)

Interrupt Vector Register (IVR)

Register Address 0 b 01010

Bit(s)

Field/Bit

Name

Conditions

/Context

Description

RW

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

RO

TypeCode

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

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

UM009402-0201