upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 515
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upd70f3422gj-gae-qs-ax
Manufacturer Part Number
upd70f3422gj-gae-qs-ax
Description
32-bit Single-chip Microcontroller
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.UPD70F3422GJ-GAE-QS-AX.pdf
(930 pages)
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Asynchronous Serial Interface (UARTA)
Bit position
7
Initial Value
Table 16-5
Address
Access
Bit name
UAnTSF
(5)
UAnSTR - UARTAn status register
The UAnSTR register is an 8-bit register that displays the UARTAn transfer
status and reception error contents.
This register can be read or written in 8-bit or 1-bit units.
<base> + 4
00
The initialization conditions are shown below.
a)
UAnSTR register contents (1/2)
Preliminary User’s Manual U17566EE1V2UM00
Register/Bit
UAnSTR register
UAnTSF bit
UAnPE, UAnFE, UAnOVE bits
UAnTSF
H
. This register is cleared by any reset.
R
7
These bits can only be cleared by writing, They cannot be set by writing 1 (even if
1 is written, the value is retained).
Function
Transfer status flag:
The UAnTSF bit is always 1 when performing continuous transmission. When
initializing the transmission unit, check that the UAnTSF bit = 0 before performing
initialization. The transmit data is not guaranteed when initialization is performed
while the UAnTSF bit = 1.
0: – When the UAnPWR bit = 0 or the UAnTXE bit = 0 has been set.
1: Write to UAnTXB bit
– When, following transfer completion, there was no next data transfer from
H
UAnTX register
R/W
6
0
R/W
5
0
R/W
4
0
Initialization conditions
• Reset
• UAnCTL0.UAnPWR = 0
• UAnCTL0.UAnTXE = 0
• 0 write
• UAnCTL0.UAnRXE = 0
R/W
3
0
UAnPE
R/W
2
a
UAnFE
R/W
1
a
Chapter 16
UAnOVE
R/W
0
515
a
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