upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 526

• Manufacturer Part Number: upd70f3422gj-gae-qs-ax
• Description: 32-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

Chapter 16
526
Figure 16-5
Caution
16.5.6 Continuous transmission procedure
UARTAn can write the next transmit data to the UAnTX register when the
UARTAn transmit shift register starts the shift operation. The transmit timing of
the UARTAn transmit shift register can be judged from the transmission enable
interrupt request signal (INTUAnT).
An efficient communication rate is realized by writing the data to be transmitted
next to the UAnTX register during transfer.
During continuous transmission execution, perform initialization after checking
that the UAnSTR.UAnTSF bit is 0. The transmit data cannot be guaranteed
when initialization is performed while the UAnTSF bit is 1.
Continuous transmission processing flow
Preliminary User’s Manual U17566EE1V2UM00
Occurrence of transmission
Required number of
writes performed?
Register settings
UAnTX write
interrupt?
Start
End
Yes
Yes
Asynchronous Serial Interface (UARTA)
No
No