Zilog Z80180 Manuel d'utilisateur Page 178

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Vue de la page 177
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.)
01Toggled
1 0 0 A18/TOUT pin is selected as a
PRT1 output function!
111
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
20
f
0 < + < 20
FFFFH 0003H 0002H 0001H 0000H 0003H 0002H 0001H 0000H 0003H0004H
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
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