Z80180/Z8S180/Z8L180
Enhanced Z180 Microprocessor
Zilog
Timer Data Register
Write (0004H)
0 < t < 20 φ
20 φ
20 φ
20 φ
20 φ
20 φ
20 φ
20 φ
20 φ
20 φ
1
Reset
Timer Data
Register
0002H 0001H 0000H 0003H 0002H
Reload
0000H 0003H
FFFFH
0004H
0003H
0001H
Reload
Timer Reload Register Write (0003H)
Timer Reload
Register
FFFFH
0003H
Write “1” to TDE
TDE Flag
TIF Flag
Timer Data Register Read
Timer Control Requestor Read
Figure 5. Timer Initialization, Count Down, and Reload Timing
Timer Data
Timer Data
Reg. = 0001H Reg. = 0000H
φ
TOUT
Figure 6. Timer Output Timing
DS971800401
P R E L I M I N A R Y
1-13
ZILOG [ ZILOG, INC. ]
