Zilog Z16C30 User Manual
Page 178

8-23
Z16C30 USC
®
U
SER
'
S
M
ANUAL
Z
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.
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