Zilog Z80180 - Manual (Page 178)

Z8018x
Family MPU User Manual
UM005003-0703
163
Figure 64 illustrates timer initialization, count down, and reload timing.
Figure 65 depicts timer output (A18/TOUT) timing.
Figure 64. Timer Initialization, Count Down, and Reload Timing Diagram
Table 23. Timer Output Control
TOC1 TOC0 OUTPUT
0 0 Inhibited (A18/TOUT pin is selected as an
address output function.)
0 1 Toggled
1 0 0 A18/TOUT pin is selected as a
PRT1 output function!
1 1 1
Timer Data Register
write (0004H)
Timer Data
Register
RESET
Reload Reload
20 f 20 f 20 f 20 f 20 f 20 f 20 f 20 f 20f
0 < + < 20
FFFFH 0003H 0002H 0001H 0000H 0003H 0002H 0001H 0000H 0003H 0004H
Timer Reload Register Write (0003H)
Timer Reload
TDE Flag
TIF Flag
Timer Data Register Read
Timer Control
Register Read
Write 1 to TDE
FFFFH 0003H
Register