Renesas M16C FAMILY series Hardware Manual page 186

M 1 6 C 2 / 8 G o r u p ( M 1 6 C
(UART0)
RxD
0
Clock source selection
CLK1 to CLK0
00
f f
1SIO or 2SIO
01
2
f
8SIO
10
f
32SIO
CKPOL
polarity
CLK
0
reversing
circuit
CTS/RTS selected
CTS / RTS
0 0
CTS from UART1
0
(UART1)
RxD
1
Clock source selection
CLK1 to CLK0
00
f f
1SIO or 2SIO
01
2
f
8SIO
10
f
32SIO
CKPOL
CLK
polarity
CLK
1
reversing
circuit
Clock output
pin select
CTS / RTS /
1 1
CTS / CLKS
0 1
(UART2)
RxD
2
Clock source selection
CLK1 to CLK0
00
f f
1SIO or 2SIO
01
2
f
8SIO
10
f
32SIO
CKPOL
polarity
CLK
2
reversing
CTS/RTS
selected
CTS / RTS
2 2
i = 0 to 2
n : Values set to the UiBRG register
i
SMD2 to SMD0, CKDIR: Bists in the UiMR register
CLK1 to CLK0, CKPOL, CRD, CRS: Bits in the UiC0 register
CLKMD0, CLKMD1, RCSP: Bits in the UCON register
Figure 14.1 Block Diagram of UARTi (i = 0 to 2)
R e . v 2 0 . 0 J a . n 3 , 1 2 0 0 7
R E J 0 9 B 0 0 4 7 0 - 2 0 0
2 / , 8 M 1 6 C 2 / 8 ) B
Main clock, PLL clock, or
on-chip oscillator clock
1/16
2
U0BRG
Internal
CKDIR=0
register
2
1 / (n +1)
0
1/16
External
CKDIR=1
1/2
Clock synchronous type
(when external clock is selected)
Clock synchronous type
(when internal clock is selected)
CLK
CTS/RTS disabled
CRS=1
V V
CRS=0 CC CC
CTS/RTS disabled
RCSP=0
CRD=1 CRD=1
CRD=0 CRD=0
RCSP=1
1/16
2
U1BRG
Internal
CKDIR=0 register
2
1 / (n +1)
1 1/16
External
CKDIR=1
1/2
Clock synchronous type
(when external clock is selected)
Clock synchronous type
(when internal clock is selected)
CLKMD0=0
CLKMD0=1
CTS/RTS selected
CTS/RTS disabled
CLKMD1=1
CRS=1
CLKMD1=0
CRS=0
V
CC
CTS/RTS disabled
CRD=1
CRD=0
RxD polarity
reversing circuit
1/16
2 U2BRG
register
Internal
CKDIR=0
2
1 / (n +1)
2 1/16
External
CKDIR=1
1/2
Clock synchronous type
(when external clock is selected)
Clock synchronous type
CLK (when internal clock is selected)
circuit
CTS/RTS disabled
CRS=1
CRS=0
V
CC
CTS/RTS disabled
CRD=1
CRD=0
page 166
f o 3 8 5
PCLK1=0
f
2SIO
1/2
f
1SIO
PCLK1=1
1/8
1/4
UART reception
Reception
Clock synchronous
control circuit
type
UART transmission
Transmission control
Clock synchronous
circuit
type
Clock synchronous type
(when internal clock is selected)
CKDIR=0
CKDIR=1
RTS
0
CTS
0
UART reception
Reception
Clock synchronous
control circuit
type
UART transmission
Transmission
Clock synchronous
control circuit
type
Clock synchronous type
(when internal clock is selected)
CKDIR=0
CKDIR=1
RTS1
CTS1
RCSP=0
CTS from UART0
0
RCSP=1
UART reception
Reception
Clock synchronous
control circuit
type
UART transmission
Transmission
Clock synchronous
control circuit
type
Clock synchronous type
(when internal clock is selected)
CKDIR=0
CKDIR=1
RTS
2
CTS
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
14.Serial I/O
TxD
0
TxD
1
TxD
2