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Renesas rl78 User Manual

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RL78/G1A 
 
CHAPTER  4   PORT  FUNCTIONS 
R01UH0305EJ0200  Rev.2.00 
 
 
117  
Jul 04, 2013 
(2)  Setting procedure when using output ports of UART0 to UART2, CSI00, CSI10, and CSI20 functions in N-ch 
open-drain output mode 
 
In case of UART0: 
P12  
In case of UART1: 
P02 
In case of UART2: 
P13 
In case of CSI00: 
P10, P12  
In case of CSI10: 
P02, P04  
In case of CSI20: 
P13, P15  
 
<1>   Using an external resistor, pull up externally the output pin to be used to the power supply of the target 
device (on-chip pull-up resistor cannot be used). 
<2>   After reset release, the port mode is the input mode (Hi-Z). 
<3>   Set the output latch of the corresponding port to 1. 
<4>   Set the corresponding bit of the POM0 and POM1 registers to 1 to set the N-ch open drain output (V
DD
 
tolerance
Note 1
/EV
DD
 tolerance
Note 2
) mode. 
<5>   Enable the operation of the serial array unit and set the mode to the UART/CSI mode. 
<6>   Set the output mode by manipulating the PM0 and PM1 registers.  At this time, the output data is high 
level, so the pin is in the Hi-Z state. 
 
Notes 1.  For 25- to 48-pin products 
 2.  For 64-pin products 
 
(3)  Setting procedure when using I/O ports of IIC00, IIC10, and IIC20 functions with a different potential (1.8 V or 
2.5 V)
 
 
In case of IIC00: P10, P11  
In case of IIC10: P03, P04  
In case of IIC20: P14, P15  
 
<1>  Using an external resistor, pull up externally the input pin to be used to the power supply of the target 
device (on-chip pull-up resistor cannot be used).
 
<2>  After reset release, the port mode is the input mode (Hi-Z).   
<3>  Set the output latch of the corresponding port to 1.  
<4>  Set the corresponding bit of the POM0 and POM1 registers to 1 to set the N-ch open drain output (V
DD
 
tolerance
Note 1
/EV
DD
 tolerance
Note 2
) mode.   
<5>  Set the corresponding bit of the PIM0 and PIM1 registers to 1 to switch to the TTL input buffer.  For V
IH 
and V
IL
, refer to the DC characteristics when the TTL input buffer is selected. 
<6>  Enable the operation of the serial array unit and set the mode to the simplified I
2
C mode.
 
<7>  Set the corresponding bit of the PM0 and PM1 registers to the output mode (data I/O is possible in the 
output mode).  At this time, the output data is high level, so the pin is in the Hi-Z state.   
 
Notes 1.  For 25- to 48-pin products 
 2.  For 64-pin products 
<R> 
<R>