z80189 ZiLOG Semiconductor, z80189 Datasheet - Page 167

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

152
UM005003-0703
Z8018x
Family MPU User Manual
•
CSI/O Operation Timing Notes
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CSI/O Operation Notes
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c. Poll the RE bit in CNTR until RE =
d. Read the receive data from TRDR.
e. Repeat steps 2 to 4 for each receive data byte.
Receive–Interrupts
a. Poll the RE bit in CNTR until RE is
b. Set the RE and EIE bits in CNTR to
c. When the receive interrupt occurs read the receive data from
d. Set the RE bit in CNTR to
e. Repeat steps 3 and 4 for each receive data byte.
Transmitter clocking and receiver sampling timings are different from
internal and external clocking modes. Figure 59 to Figure 62 illustrate
CSI/O Transmit/Receive Timing.
The transmitter and receiver is disabled TE and RE
initializing or changing the baud rate.
Disable the transmitter and receiver (TE and RE =
initializing or changing the baud rate. When changing the baud rate
after completion of transmission or reception, a delay of at least one
bit time is required before baud rate modification.
When RE or TE is cleared to
or transmit operation is immediately terminated. Normally, TE or RE
is only cleared to
Simultaneous transmission and reception is not possible. Thus, TE
and RE are not both
TRDR.
0
when EF is
1
at the same time.
0
1
by software, a corresponding receive
1
.
.
0
0
1
.
.
.
0
= 0
) before
) when