R01UH0092EJ0110 Rev.1.10
Page 453 of 807
Jul 31, 2012
M16C/64C Group
23. Serial Interface UARTi (i = 0 to 2, 5 to 7)
Figure 23.3 Block Diagram of UART2 and UART5 to UART7
Note:
1. UART2 is N-channel open drain output. CMOS output cannot be selected.
n: Value set to the UiBRG register
i = 2, 5 to 7
RXDi
Reception
control circuit
Transmission
control circuit
1/(n+1)
1/16
1/16
1/2
UiBRG
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)
CLKi
Clock source selection
f1SIO or
f2SIO
f8SIO
f32SIO
Internal
External
RTSi
CTSi
TXDi
Transmit/
receive
unit
CTS/RTS disabled
CTS/RTS disabled
CTS/RTS selected
Receive
clock
Transmit
clock
CLK1 to CLK0
00b
01b
10b
CKDIR
CKPOL
UART reception
UART transmission
Clock sync type
CKDIR
1
0
0
1
VSS
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
001b, 010b
100b, 101b, 110b
001b, 010b
0
1
CRS
CRD
PCLK1
: Bit in the PCLKR register
SMD2 to SMD0, CKDIR
: Bits in the UiMR register
CLK1 to CLK0, CKPOL, CRD, CRS : Bits in the UiC0 register
CTSi/
RTSi
f1
RXD polarity
switching circuit
CLK
polarity
reversing
circuit
TXD
polarity
switching
circuit
(1)
Содержание M16C Series
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