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R01UH0336EJ0102 Rev.1.02
Page 1249 of 1538
Jul 17, 2014
V850E2/PG4-L
Section 22 Synchronous/Asynchronous Serial Interface H (UARTH)
(c)
Example of handshake signals (to wait for writing to URTHnTXE) in
transmission
Reception
When the receive data register is empty, the other party is notified of readiness
to receive data by placing the reception enable signal (URTHnRTS) at the
active level. When the receive data register is not empty (reading is
incomplete), the URTHnRTS signal is placed at the inactive level because the
register is not ready to receive data. The URTHnRTS signal must be placed at
the inactive level at the time of sampling of the first bit of received data.
(a)
Example of handshake signals in reception
State of operation
L
URTHnTXD pin
URTHnCTS pin
(input)
URTHnTIT
interrupt
State of the transmit
data register
Initialization
Data transmission
Data transmission
Waiting for CTS
Empty
Full
Empty
Full
Empty
Writing to the transmit data register
Writing to the transmit data register
Writing to the transmit data register
URTHnTXE bit = 1
URTHnRXD pin
URTHnRTS pin
(output)
URTHnTIR
interrupt
State of the receive
data register
URTHnRXE bit = 1
State of operation
Empty
Data reception
Waiting
for reception
Data reception
Waiting
for reception
Initialization
Full
Empty
Full
Reading of the receive data register
Waiting
for reception
Содержание V850 Series
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