Zilog Z16C30 - 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.
UM009402-0201