Zilog
Z80180/Z8S180/Z8L180
Enhanced Z180 Microprocessor
Timer Data Register
Write (0004H)
Reset
Timer Data
Register
FFFFH
0004H
0 < t < 20
φ
20
φ
20
φ
20
φ
20
φ
20
φ
20
φ
20
φ
20
φ
20
φ
1
0003H 0002H
0001H 0000H 0003H 0002H 0001H 0000H 0003H
Timer Reload Register Write (0003H)
Timer Reload
Register
Reload
Reload
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
φ
Timer Data
Reg. = 0001H
Timer Data
Reg. = 0000H
TOUT
Figure 6. Timer Output Timing
DS971800401
PRELIMINARY
1-13