Mitsubishi microcomputers
M16C / 61 Group
Serial I/O
SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER
No reverse
Reverse
RxD data
reverse circuit
RxD2
Clock
synchronous type
UART
(7 bits)
UART
(8 bits)
Clock
synchronous
type
UART2 receive register
PAR
disabled
UART(7 bits)
1SP
SP
PAR
SP
2SP
Clock
synchronous type
PAR
enabled
UART
UART
(9 bits)
UART
(8 bits)
UART
(9 bits)
UART2 receive
buffer register
0
0
0
0
0
0
0
D
8
D7
D6
D5
D
4
D3
D2
D
1
D0
Address 037E16
Address 037F16
Logic reverse circuit + MSB/LSB conversion circuit
Data bus high-order bits
Data bus low-order bits
Logic reverse circuit + MSB/LSB conversion circuit
UART2 transmit
buffer register
D7
D6
D
5
D
4
D3
D
2
D
1
D
0
D8
Address 037A16
Address 037B16
UART
(8 bits)
UART
(9 bits)
UART
(9 bits)
Clock
synchronous type
PAR
enabled
UART
2SP
SP
SP
PAR
1SP
Clock
synchronous
type
PAR
disabled
UART
(7 bits)
UART
(8 bits)
UART(7 bits)
UART2 transmit register
“0”
Clock
synchronous type
Error signal output
disable
No reverse
TxD data
reverse circuit
Error signal
output circuit
TxD2
Reverse
Error signal output
enable
SP: Stop bit
PAR: Parity bit
Figure 1.17.3. Block diagram of UART2 transmit/receive unit
90
MITSUBISHI [ Mitsubishi Group ]
