Renesas M16C Series User Manual page 67

M30245 Group
(e) Bus collision detection function
This function is to sample the output level of the TxD pin and the input level of the RxD pin; if their
values are different, then an interrupt request occurs.
The following examples are described in section 2.4.2 and 2.4.3.
• Transmission WITH: CTS function, WITHOUT: other functions
• Reception WITH: RTS function, WITHOUT: other functions
Also, the SIM interface is used by adding some extra settings in clock-asynchronous serial I/O mode.
Direct or inverse format is selected by connecting SIM card.
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The following examples are described in section 2.4.4 and 2.4.5.
• Transmission WITH: direct format
• Reception WITH: direct format
(6) Input to the serial I/O and the direction register
To input an external signal to the serial I/O, set the direction register of the relevant port to input.
(7) Pins related to the serial I/O
_________ _________ __________ _________
• CTS
_________ _________ _________ _________
• RTS
• CLK
• RxD
• TxD
Note: Since TxD
Rev.2.00 Oct 16, 2006
REJ09B0340-0200
_______
_______
, CTS , CTS , CTS pins
0 1 2 3
, RTS , RTS , RTS pins
0 1 2 3
, CLK , CLK , CLK pins
0 1 2 3
, RxD , RxD , RxD pins
0 1 2 3
, TxD , TxD , TxD pins
0 1 2 3
pin is N-channel open drain, this pin needs pull-up resistor.
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_______
:Input pins for the CTS function
_______
:Output pins for the RTS function
:Input pins for the transfer clock
:Input pins for data
:Output pins for data (Note)
2. UART