Renesas rl78 User Manual

 

RL78/G1A 

 

CHAPTER  2   PIN  FUNCTIONS 

(2/2) 

Function Name 

I/O 

Function 

V

DD

  

− 

<25-pin, 32-pin 48-pin> 

Positive power supply for port pin other than P20 to P27, P150 and RESET, 

REGC pin. 

<64-pin > 

Positive power supply for P121 to P124, P137 and RESET, REGC pin. 

EV

DD0

 

− 

Positive power supply for ports (other than P20 to P27, P121 to P124, P137,  

P150 to P154)  

AV

DD

 

− 

Positive power supply for P20 to P27, P150 to P154, and A/D converter 

AV

REFP 

 

Input 

A/D converter reference potential (+ side) input 

AV

REFM 

 Input 

A/D converter reference potential (

− side) input 

Make AV

REFM

 pin the same potential as AV

SS

 and V

SS

 pin. 

V

SS 

 

− 

<25-pin, 32-pin, 48-pin> 

Ground potential for port pin other than P20 to P27, P150 and RESET, REGC 

pin. 

<64-pin> 

Ground potential for P121 to P124, P137 and RESET, REGC pin.  

EV

SS0

 

− 

Ground potential for ports (other than P20 to P27, P121 to P124, P137, P150 to 

P154)  

Make EV

SS0

 pin the same potential as V

SS

 pin. 

AV

SS

 

− 

Ground potential for A/D converter, P20 to P27, and P150 to P154.  Use this pin 

with the same potential as EV

SS0

, and V

SS

.  

TOOLRxD  

Input 

UART reception pin for the external device connection used during flash memory 

programming 

TOOLTxD  

Output 

UART transmission pin for the external device connection used during flash 

memory programming 

TOOL0  

I/O 

Data I/O for flash memory programmer/debugger 

P40/TOOL0 Operating 

Mode 

EV

DD0

 

Normal operation mode 

0 V 

Flash memory programming mode 

Remark  Use bypass capacitors (about 0.1 

μ

F) as noise and latch up countermeasures with relatively thick wires at 

the shortest distance to V

DD

 to V

SS

, EV

DD0

 to EV

SS0

 lines. 

R01UH0305EJ0200  Rev.2.00 

 

 

34  

Jul 04, 2013