R01UH0092EJ0110 Rev.1.10
Page 452 of 807
Jul 31, 2012
M16C/64C Group
23. Serial Interface UARTi (i = 0 to 2, 5 to 7)
Figure 23.2
UART1 Block Diagram
n: Value set to the U1BRG register
RXD1
Reception
control circuit
Transmission
control circuit
1/(n+1)
1/16
1/16
1/2
U1BRG
register
Clock synchronous type
(when internal clock is selected)
Clock sync type
Clock synchronous type
(when internal clock is selected)
Clock synchronous type
(when external clock is selected)
CLK1
Clock source selection
f1SIO or
f2SIO
f8SIO
f32SIO
Internal
External
TXD1
Transmit/
receive
unit
Receive
clock
Transmit
clock
CLK1 to CLK0
00b
01b
10b
CKDIR
UART reception
UART transmission
Clock sync type
CKDIR
0
1
PCLK1
f1SIO or f2SIO
1/2
1/2
1/8
f8SIO
1/4
f32SIO
f1SIO
f2SIO
0
1
SMD2 to SMD0
100b, 101b, 110b
100b, 101b, 110b
0
1
RTS1
CTS1
Clock output
pin select
CTS1/RTS1/
CTS0/CLKS1
CTS/RTS disabled
CTS/RTS selected
VSS
CTS/RTS disabled
CRD
1
0
0
CRS
0
0
1
to CTS0 in UART0
CLKMD0
1
CKPOL
1
CLKMD1
1
0
RCSP
PCLK1
: Bit in the PCLKR register
SMD2 to SMD0, CKDIR
: Bits in the U1MR register
CLK1 to CLK0, CKPOL, CRD, CRS : Bits in the U1C0 register
CLKMD0, CLKMD1, RCSP
: Bits in the UCON register
f1
RXD polarity
switching circuit
CLK
polarity
reversing
circuit
TXD
polarity
switching
circuit
001b, 010b
001b, 010b
Содержание M16C Series
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