Zilog Z80180 - Manual (Page 93)

Z8018x
Family MPU User Manual
78
UM005003-0703
Figure 38. INT0 Mode 1 Timing
INT0 Mode 2
This method determines the restart address by reading the contents of a
table residing in memory. The vector table consists of up to 128 two-byte
restart addresses stored in low byte, high byte order.
Phi
A0 – A19
WR
RD
MREQ
D0 – D7
M1
PCH PCL
PC SP-1 SP-2 0038H
INT0
T1 T3 TW* T2 T1 T2 T3 T1 T2 T3 T1 T2 T3 TW*
Last MC
PC is pushed onto stack
Op Code Fetch Cycle INT0 Acknowledge Cycle
*Two Wait States are automatically inserted
ST
IORQ