z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 179

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

164
UM005003-0703
Z8018x
Family MPU User Manual
TIE0
TIF0
TIF1
TIE1
Figure 65.
PRT Interrupts
The PRT interrupt request circuit is illustrated in Figure 66.
Figure 66.
PRT and RESET
During RESET, the bits in TCR are initialized as defined in the TCR
register description. Down counting is stopped and the TMDR and RLDR
registers are initialized to
address output function.
TOUT
Phi
Timer Output Timing Diagram
PRT Interrupt Request Generation
Timer Data
Reg. = 0001H
IEF1
FFFFH
. The A18/TOUT pin reverts to the
Timer Data
Reg. = 0000H
PRT1 Interrupt
Request
PRT0 Interrupt
Request