Renesas RL78 Series User Manual

RL78/F13, F14 CHAPTER 15 SERIAL ARRAY UNIT
R01UH0368EJ0210 Rev.2.10 969
Dec 10, 2015
Figure 15-128. Flowchart of UART Transmission (in Continuous Transmission Mode)
Starting UART communication
Writing 1 to the SSmn bit
Writing transmit data to the
SDRmn register
Writing 1 to the STmn bit
SMRmn, SCRmn: Setting communication
SDRmn[15:9]: Setting transfer rate
SOLmn: Setting output data level
SOm, SOEm: Setting output
N
o
N
o
N
o
Y
es
Setting the SAUmEN bit of the
PER0 register to 1
Setting operation clock by
the SPSm register
Port manipulation
End of communication
Clearing the MDmn0 bit to 0
Y
es
TSFmn = 1?
T
r
ansfer end interrupt
g
enerated?
N
o
Y
es
N
o
Communication continued?
Y
es
Y
es
Clearing the SAUmEN bit of the
PER0 register to 0
Transmitting next data?
<2>
<3>
Buffer empty interrupt
generated?
Writing 1 to the MDmn0 bit
<4>
<5>
S
pec
if
y
th
e
i
n
iti
a
l
se
tti
ngs w
hil
e
th
e
SEmn bit of serial channel enable status
register m (SEm) is 0 (operation is
stopped).
<1>
Select the buffer empty interrupt.
<6>
Remarks 1. <1> to <6> in the figure correspond to <1> to <6> in Figure 15-127 Timing Chart of UART
Transmission (in Continuous Transmission Mode).
2. m: Unit number (m = 0, 1), n: Channel number (n = 1), mn = 00, 10

Renesas RL78 Series Specifications

General

Core	RL78
CPU Clock Speed	Up to 32 MHz
Flash Memory	Up to 512 KB
RAM	Up to 32 KB
Operating Voltage	1.6 V to 5.5 V
Low Power Modes	HALT, STOP, SNOOZE
CPU Architecture	16-bit
Temperature Range	-40°C to +85°C
Package	LQFP
Timers	16-bit timers
Communication Interfaces	UART, I2C, LIN
A/D Converter	12-bit