z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 178

• Manufacturer Part Number: z80189
• Description: Z80180, Z8s180, Z8l180 Mpu Operation
• Manufacturer: ZiLOG Semiconductor

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