Renesas M16C/29 Series Hardware Manual page 184

M16C/29 Group
(UART0)
RxD
0
Clock source selection
f f
1SIO or 2SIO
f
8SIO
f
32SIO
CLK
0
CTS/RTS selected
CTS / RTS
0 0
CTS
0
(UART1)
RxD
1
Clock source selection
CLK1 to CLK0
f f
1SIO or 2SIO
01
f
8SIO
f
32SIO
CLK
1
reversing
CTS / RTS /
1 1
CTS / CLKS
0 1
(UART2)
RxD
2
Clock source selection
f f
1SIO or 2SIO
f
8SIO
f
32SIO
CLK
2
CTS / RTS
2 2
i = 0 to 2
n : Values set to the UiBRG register
i
SMD2 to SMD0, CKDIR: UiMR register's bits
CLK1 to CLK0, CKPOL, CRD, CRS: UiC0 register's bits
CLKMD0, CLKMD1, RCSP: UCON register's bits
Figure 14.1.1. Block diagram of UARTi (i = 0 to 2)
Rev.1.00 Nov 01,2004
REJ09B0101-0100Z
Main clock or on-chip oscillator clock
CLK1 to CLK0
00
2
U0BRG
Internal
01
2 CKDIR=0 register
10
2
1 / (n +1)
0
External
CKDIR=1
Clock synchronous type
(when external clock is selected)
CKPOL
Clock synchronous type
(when internal clock is selected)
CLK
polarity
reversing
circuit
CTS/RTS disabled
CRS=1
V V
CRS=0 CC CC
CTS/RTS disabled
RCSP=0
CRD=1 CRD=1
CRD=0 CRD=0
from UART1
RCSP=1
00
2
U1BRG
Internal
2 CKDIR=0 register
10
2
1 / (n +1)
1
External
CKDIR=1
Clock synchronous type
CKPOL (when external clock is selected)
Clock synchronous type
CLK
(when internal clock is selected)
polarity
CLKMD0=0
circuit
CLKMD0=1
Clock output
pin select CTS/RTS selected
CTS/RTS disabled
CLKMD1=1
CRS=1
CLKMD1=0
CRS=0
V
CC
CTS/RTS disabled
RxD polarity
reversing circuit
CLK1 to CLK0
00
2 U2BRG
01 register
2 Internal CKDIR=0
10
2
1 / (n +1)
2
External
CKDIR=1
Clock synchronous type
(when external clock is selected)
CKPOL
Clock synchronous type
CLK (when internal clock is selected)
polarity
reversing
circuit
CTS/RTS CTS/RTS disabled
selected
CRS=1
CRS=0
V
CC
CTS/RTS disabled
CRD=1
CRD=0
page 164 of 402
PCLK1=0
f
2SIO
1/2
f
1SIO
PCLK1=1
1/8
1/4
UART reception
1/16
Reception
Clock synchronous
control circuit
type
UART transmission
1/16
Transmission control
Clock synchronous
circuit
type
Clock synchronous type
(when internal clock is selected)
1/2
CKDIR=0
CKDIR=1
RTS
0
CTS
0
UART reception
1/16
Reception
Clock synchronous
control circuit
type
UART transmission
1/16
Transmission
Clock synchronous
control circuit
type
Clock synchronous type
(when internal clock is selected)
1/2
CKDIR=0
CKDIR=1
RTS1
CTS1
RCSP=0
CRD=1
CTS from UART0
0
CRD=0
RCSP=1
UART reception
1/16
Reception
Clock synchronous
control circuit
type
UART transmission
1/16
Transmission
Clock synchronous
control circuit
type
Clock synchronous type
(when internal clock is selected)
1/2
CKDIR=0
CKDIR=1
RTS
2
CTS
2
14.1 UARTi (i=0 to 2)
f f
1SIO or 2SIO
f
8SIO
f
32SIO
Receive
clock
Transmit/
receive
unit
Transmit
clock
Receive
clock
Transmit/
receive
unit
Transmit
clock
TxD
polarity
reversing
circuit
Receive
clock
Transmit/
receive
unit
Transmit
clock
TxD
0
TxD
1
TxD
2