Renesas R8C/15 Información técnica Pagina 139

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R8C/14 Group, R8C/15 Group 14. Serial Interface
Rev.2.10 Jan 19, 2006 Page 125 of 253
REJ09B0164-0210
14. Serial Interface
Serial Interface is configured with one channels: UART0. UART0 has an exclusive timer to generate a
transfer clock.
Figure 14.1 shows a UART0 Block Diagram. Figure 14.2 shows a UART0 Transmit/Receive Unit.
UART0 has two modes: clock synchronous serial I/O mode, and clock asynchronous serial I/O mode (UART
mode).
Figure 14.3 to 14.5 show the UART0-associated registers.
Figure 14.1 UART0 Block Diagram
=01b
f8
f1
=10b
CLK1 to CLK0=00b
RXD0
f32
1/16
1/16
1/2
1/(n0+1)
UART reception
UART transmission
Clock synchronous type
(when internal clock is selected)
Clock
synchronous type
Reception control
circuit
Transmission
control circuit
CKDIR=0
CKDIR=1
Receive
clock
Transmit
clock
Transmit/
receive
unit
U0BRG register
CKDIR=0
Internal
External
CKDIR=1
(UART0)
TXD0
CLK
polarity
reversing
circuit
CLK0
Clock
synchronous type
Clock synchronous type
(when external clock is selected)
Clock synchronous type
(when internal clock is selected)
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