M16C/62P Group (M16C/62P, M16C/62PT)
17. Serial Interface
Rev.2.41
Jan 10, 2006
Page 178 of 390
REJ09B0185-0241
Figure 17.2
UART1 Block Diagram
RXD1
Reception
control circuit
Transmission
control circuit
1 / (n1+1)
1/16
1/16
1/2
U1BRG
register
Clock synchronous type
(when internal clock is selected)
Clock synchronous
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
(UART1)
CLK1 to CLK0
00
01
10
CKDIR
UART reception
UART transmission
Clock synchronous
type
CKDIR
RXD polarity reversing
circuit
0
1
SMD2 to SMD0
010, 100, 101, 110
001
010, 100, 101, 110
001
0
1
RTS1
CTS1
Clock output
pin select
CTS1 / RTS1/
CTS0 / CLKS1
VSS
CRD
0
0
0
CRS
0
0
1
CLKMD0
1
CLK
polarity
reversing
circuit
CKPOL
1
CLKMD1
1
1
RCSP
n1: Values set to the U1BRG register
PCLK1: Bit in the PCLKR register
SMD2 to SMD0, CKDIR: Bits in U1MR register
CLK1 to CLK0, CKPOL, CRD, CRS: Bits in U1C0 register
CLKMD0, CLKMD1, RCSP: Bits in UCON register
PCLK1
f1SIO or f2SIO
1/2
Main clock, PLL clock, or on-chip oscillator clock
1/2
1/8
f8SIO
f32SIO
f1SIO
f2SIO
0
1
1/4
Receive
clock
Transmit
clock
Transmit/
receive
unit
TXD
polarity
reversing
circuit
CTS0 from UART0
CTS/RTS disabled
CTS/RTS disabled
CTS/RTS selected
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