m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 272

• Manufacturer Part Number: m37905
• Description: Mitsubishi 16-bit Single-chip Microcomputer 7700 Family / 7900 Series
• Manufacturer: Renesas Electronics Corporation.

Fig. 11.2.13 Structure of serial I/O pin control register
11.2.8 Serial I/O pin control register
Figure 11.2.13 shows the structure of the seral I/O pin control register.
(1) CTS
(2) CTS
(3) TxD
(4) TxD
(5) CTS
(6) TxD
Serial I/O pin control register (Address AC
Note: Valid when the CTS/RTS enable bit (bit 4 at addresses 34
Refer to section “11.2.10 CTS/RTS function.”
Refer to section “11.2.10 CTS/RTS function.”
When this bit is set to “1,” the TxD
reception is performed, the TxD
sure to clear this bit to “0.”
When this bit is set to “1,” the TxD
reception is performed, the TxD
sure to clear this bit to “0.”
Refer to section “11.2.10 CTS/RTS function.”
When this bit is set to “1,” the TxD
reception is performed, the TxD
sure to clear this bit to “0.”
7, 6
Bit
0
1
2
3
4
5
0
1
2
0
1
2
/P1
/P1
/P8
/RTS
/RTS
/RTS
CTS
(Note)
CTS
(Note)
TxD
TxD
CTS
(Note)
TxD
The value is “00” at reading.
3
7
3
switch bit (bit 2)
switch bit (bit 3)
switch bit (bit 5)
0
1
2
0
1
2
0
1
2
/P1
/P1
/P8
/RTS
/RTS
/RTS
separate select bit (bit 0)
separate select bit (bit 1)
separate select bit (bit 4)
3
7
3
switch bit
switch bit
switch bit
0
1
2
Bit name
separate select bit
separate select bit
separate select bit
0
1
2
7905 Group User’s Manual Rev.1.0
pin can be used as the P8
pin can be used as the P1
pin can be used as the P1
0 : CTS
1 : CTS
0 : Functions as TxD
1 : Functions as P8
0 : Functions as TxD
1 : Functions as P1
0
1
2
0 : Functions as TxD
1 : Functions as P1
0 : CTS
1 : CTS
0 : CTS
1 : CTS
pin functions as a programmable I/O port pin (P1
pin functions as a programmable I/O port pin (P1
pin functions as a programmable I/O port pin (P8
16
)
2
2
0
0
1
1
/RTS
/RTS
/RTS
/RTS
/RTS
/RTS
2
2
16
0
0
1
1
are used together.
are separated.
, 3C
are used together.
are separated.
are used together.
are separated.
16
3
7
3
, and B4
.
.
.
2
1
0
.
.
.
Function
16
) is “0.”
3
3
7
pin. When performing transmission, be
pin. When preforming transmission, be
pin. When preforming transmission, be
b7 b6 b5 b4 b3 b2 b1 b0
11.2 Block description
SERIAL I/O
At reset
0
0
0
0
0
0
0
3
7
3
). When only
). When only
). When only
R/W
RW
RW
RW
RW
RW
RW
—
11-17