Z80189 Datasheet, PDF (23/107 Pages) Zilog, Inc. – GENERAL-PURPOSE EMBEDDED CONTROLLERS

Zilog
PRELIMINARY
16550 MIMIC TIMING (Continued)
Z80189/Z8L189
GENERAL-PURPOSE EMBEDDED CONTROLLERS
Table 7. Interrupt Timing RCVR FIFO Table
No Sym Parameter
Z8L189-20 MHz
Min
Max
Z80189-33 MHz
Min
Max
14 tSINT Delay from Stop to Set
Interrupt
2
2
15 tRINT Delay from /HRD
(RD RBR or RD LSR)
to Reset Interrupt
2
2
Units
phi cycles
phi cycles
/RD (MPU)
TxFIFO
HINTR
THRE
/WR (Host)
THR
/RD (Host)
11R
17
16
18
Figure 26. Interrupt Timing Transmitter FIFO
DS971890301
23