m37905 Renesas Electronics Corporation., m37905 Datasheet - Page 277

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

SERIAL I/O
11.3 Clock synchronous serial I/O mode
Fig. 11.3.1 Polarity of transfer clock
11-22
(2) Input of transfer clock from the external
(3) Porarity of transfer clock
A clock input from the CLK
As shown in Figure 11.3.1, the polarity of the transfer clock can be selected by the CLK polarity
select bit (bit 6 at addresses 34
RxD
TxD
RxD
CLK
CLK
TxD
CLK polarity select bit = 0
CLK polarity select bit = 1
i
i
i
i
i
i
The transmit data is output to the TxD
The transmit data is output to the TxD
The level at the CLK
The level at the CLKi pin is “L” when the transfer is not performed.
input from the RxD
input from the RxD
D
D
D
D
0
0
0
0
i
i
pin at the rising edge of the transfer clock.
pin at the falling edge of the transfer clock.
i
i
pin is “H” when the transfer is not performed.
pin becomes the transfer clock.
D
D
D
D
7905 Group User’s Manual Rev.1.0
1
1
1
1
16
, 3C
166
D
D
D
D
2
2
2
2
i
i
, B4
pin at the falling edge of a transfer clock, and the receive data is
pin at the rising edge of a transfer clock, and the receive data is
16
).
D
D
D
D
3
3
3
3
D
D
D
D
4
4
4
4
D
D
D
D
5
5
5
5
D
D
D
D
6
6
6
6
D
D
D
D
7
7
7
7