m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 273

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

Fig. 11.2.14 Relationship between port P1 and port P8 direction registers and serial I/O’s I/O pins
SERIAL I/O
11.2 Block description
11-18
11.2.9 Port P1 direction register, Port P8 direction register
I/O pins for serial I/O are multiplexed with port P1 and P8 pins. When using pins P1
and P8
direction registers to “0” in order to set these pins for the input mode. When using these pins as other serial
I/O’s pins (CTS
port P1 and port P8 direction registers’ contents. Figure 11.2.14 shows the relationship between the port
P1 and port P8 direction registers and serial I/O’s I/O pins. For details, refer to the description of each
operating mode.
Port P1 direction register (Address
Port P8 direction register (Address
Notes 1: When using pin CTS
7 to 4
2
Bit
Bit
as serial I/O’s input pins (CTS
0
1
2
3
0
1
2
3
4
5
6
7
2: ( ) shows the I/O pins of other internal peripheral devices which are multiplexed.
Pin CTS
Pin CTS
Pin RxD
Pin TxD
Pin CTS
Pin CTS
Pin RxD
Pin TxD
Pin CTS
Pin CTS
Pin RxD
Pin TxD
Nothing is assigned.
i
/RTS
Corresponding pin name
Corresponding pin name
0
1
2
0
1
0
0
1
1
2
i
2
2
, CLK
/RTS
/CLK
/RTS
/CLK
/RTS
/CLK
(Pin AN
(Pin AN
0
1
0
1
2
2
(Pin AN
(Pin AN
i
, TxD
11
2
10
/RTS
)
)
2
i
, be sure that the D-A
9
), these pins are forcibly set as I/O pins for serial I/O regardless of the
8
(Note 1)
)
/DA
5
14
1
16
)
7905 Group User’s Manual Rev.1.0
16
)
)
i
, RxD
0 : Input mode
1 : Output mode
When using pins P1
I/O’s input pins (CTS
the corresponding bits to “0.”
0 : Input mode
1 : Output mode
When using pins P8
pins (CTS
“0.”
i
), clear the corresponding bits of the port P1 and port P8
1
output enable bit (bit 1 at address 96
2
, RxD
2
), clear the corresponding bits to
1
1
, P1
Function
Function
0
and P8
, RxD
2
, P1
0
2
, CTS
5
, and P1
as serial I/O’s input
1
, RxD
6
as serial
1
16
b7 b6 b5 b4 b3 b2 b1 b0
b7 b6 b5 b4 b3 b2 b1 b0
), clear
) = “0” (output disabled).
1
, P1
Undefined
At reset
At reset
0
0
0
0
0
0
0
0
0
0
0
0
2
, P1
5
R/W
R/W
, P1
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
RW
–
6
, P8
1
,