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R01UH0336EJ0102 Rev.1.02
Page 1220 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 22 Synchronous/Asynchronous Serial Interface H (UARTH)
(4)
URTHnTRG – UARTHn Trigger Register
This register controls use of the BF as a trigger for transmission or reception
by UARTHn.
Access
This register can be read/written in 8- or 1-bit units.
Address
<URTHn_base1> + 0C
H
Initial value
00
H
This register is initialized by a reset from any source.
7
6
5
4
3
2
1
0
0
URTHn
BRT
URTHn
BTT
0
0
0
0
0
R
R/W
R/W
R
R
R
R
R
Table 22-11
URTHnTRG Register Contents (1/2)
Bit Position
Bit Name
Function
6
URTHnBRT
BF reception trigger
0: The value read is always 0. Writing 0 is ignored.
1: Enables BF reception.
•
When reception is enabled, writing 1 to this bit enables BF reception
(URTHnSTR0.URTHnSSBR = 1) and BF reception processing begins when
the falling edge of the receive serial signal is detected.
•
If 1 is written to this bit during reception processing, the current reception
processing is terminated. Consequently, the received value is not stored, the
framing, parity and overflow error bits are not updated on the basis of the
received data, and no interrupts are generated. Meanwhile, the value of the
BF counter stays in continuous use.
•
After BF reception, the reception status is set according to the
URTHnCTL1.URTHnSLBM setting.
•
Setting this bit to 1 is only allowed while reception is enabled
(URTHnCTL0.URTHnPW = URTHnCTL0.URTHnRXE = 1).
After URTHnBRT is set to 1, completion of BF reception is reported by either of
the following 2 methods, based on the URTHnCTL1.URTHnSLBM setting:
After setting the URTHnBRT bit to 1, do not write 1 to the URTHnBRT bit again
until a reception-complete interrupt is generated.
•
If URTHnCTL1.URTHnSLBM = 0, a reception interrupt request URTHnTIR is
output on completion of BF reception.
•
If URTHnCTL1.URTHnSLBM = 1, when BF reception is complete,
URTHnSTR1.URTHnBSF is set to 1 and a status interrupt request
(URTHnTIS) is output on completion of BF reception.
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