113
Mitsubishi microcomputers
M16C / 62T Group
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
Serial I/O
Figure 1.19.1. Block diagram of UARTi (i = 0 to 2)
n0 : Values set to UART0 bit rate generator (BRG0)
n1 : Values set to UART1 bit rate generator (BRG1)
n2 : Values set to UART2 bit rate generator (BRG2)
RxD2
Reception
control circuit
Transmission
control circuit
1 / (n2+1)
1/16
1/2
Bit rate generator
(address 037916)
Clock synchronous type
(when internal clock is selected)
UART reception
Clock synchronous type
UART transmission
Clock synchronous type
(when internal clock is selected)
Clock synchronous type
(when external clock is
selected)
Receive
clock
Transmit
clock
CLK2
CTS2 / RTS2
f1
f8
f32
Vcc
RTS2
CTS2
TxD2
(UART2)
RxD polarity
reversing circuit
TxD
polarity
reversing
circuit
RxD0
1 / (n0+1)
1/2
Bit rate generator
(address 03A116)
Clock synchronous type
(when internal clock is selected)
UART reception
Clock synchronous type
UART transmission
Clock synchronous type
(when internal clock is selected)
Clock synchronous type
(when external clock is
selected)
Receive
clock
Transmit
clock
CLK0
Clock source selection
CTS0 / RTS0
f1
f8
f32
Reception
control circuit
Transmission
control circuit
Internal
External
Vcc
RTS0
CTS0
TxD0
Transmit/
receive
unit
RxD1
1 / (n1+1)
1/16
1/2
Bit rate generator
(address 03A916)
Clock synchronous type
(when internal clock is selected)
UART reception
Clock synchronous type
UART transmission
Clock synchronous type
(when internal clock is selected)
Clock synchronous type
(when external clock is
selected)
Receive
clock
Transmit
clock
CLK1
Clock source selection
f1
f8
f32
Reception
control circuit
Transmission
control circuit
Internal
External
RTS1
CTS1
TxD1
(UART1)
(UART0)
CLK
polarity
reversing
circuit
CLK
polarity
reversing
circuit
CTS/RTS disabled
CTS/RTS separated
Clock output pin
select switch
CTS1 / RTS1
/ CTS0 / CLKS1
CTS/RTS disabled
CTS0 from UART1
CTS/RTS selected
CTS/RTS disabled
VCC
CTS0 to UART0
CTS0
CTS/RTS disabled
CTS/RTS separated
CTS/RTS disabled
CTS/RTS
selected
CLK
polarity
reversing
circuit
Internal
External
Clock source selection
Transmit/
receive
unit
Transmit/
receive
unit
1/16
Note 1: In M30623(80-pin package), CLK2 and CTS2/RTS2 have no external pin.
Note 2: In M30623(80-pin package), do not use UART2 as clock synchronous serial I/O.