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R8C/29 Datasheet(PDF) 248 Page - Renesas Technology Corp

Part # R8C/29
Description  RENESAS 16-BIT SINGLE-CHIP MCU R8C FAMILY / R8C/2x SERIES
PDF  471 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

R8C/29 Datasheet(HTML) 248 Page - Renesas Technology Corp

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R8C/28 Group, R8C/29 Group
15. Serial Interface
Rev.2.10
Sep 26, 2008
Page 231 of 441
REJ09B0279-0210
15. Serial Interface
The serial interface consists of two channels (UART0 and UART1). Each UARTi (i = 0 or 1) has an exclusive timer to
generate the transfer clock and operates independently.
Figure 15.1 shows a UARTi (i = 0 or 1) Block Diagram. Figure 15.2 shows a UARTi Transmit/Receive Unit.
UART0 has 2 modes: clock synchronous serial I/O mode and clock asynchronous serial I/O mode (UART mode).
UART1 has only clock asynchronous serial I/O mode (UART mode).
Figures 15.3 to 15.7 show the registers associated with UARTi.
Figure 15.1
UARTi (i = 0 or 1) Block Diagram
= 01b
f8
f1
= 10b
CLK1 to CLK0
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
switch
circuit
CLK0
Clock
synchronous type
Clock synchronous type
(when external clock is selected)
Clock synchronous type
(when internal clock is selected)
RXD1
Transmit/
receive
unit
(UART1)
TXD1
U1PINSEL
= 01b
f8
f1
= 10b
CLK1 to CLK0
f32
1/16
1/16
1/(n0+1)
UART reception
UART transmission
Reception control
circuit
Receive
clock
Transmit
clock
U1BRG register
= 00b
= 00b
Transmission
control circuit



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