z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 155

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

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UM005003-0703
Z8018x
Family MPU User Manual
OVRN0
RDRF0
OVRN1
RDRF1
DCD0
PE0
FE0
PE1
FE1
RTS0 Flag
RTS0 Pin
Figure 54.
Figure 55 illustrates the ASCI interrupt request generation circuit.
Figure 55.
WR
Phi
TDRE1
TDRE0
TIE1
TIE0
RIE1
RIE0
ASCI Interrupt Request Circuit Diagram
RTS0 Timing Diagram
I/O Instruction
T1
IEF1
I/O write cycle
T2
T3
ASCI0 Interrupt
Request
ASCI1 Interrupt
Request
T1