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Z8018x

Family MPU User Manual

152

UM005003-0703

c. Poll the RE bit in CNTR until RE = 0.

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

TRDR.

d. Set the RE bit in CNTR to

e. Repeat steps 3 and 4 for each receive data byte.

CSI/O Operation Timing Notes

•

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 = 0) when

initializing or changing the baud rate.

CSI/O Operation Notes

•

Disable the transmitter and receiver (TE and RE = 0) before

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 0 by software, a corresponding receive

or transmit operation is immediately terminated. Normally, TE or RE

is only cleared to

0 when EF is 1.

•

Simultaneous transmission and reception is not possible. Thus, TE

and RE are not both

1 at the same time.

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