Datasheet

RL78/L12 CHAPTER 2 PIN FUNCTIONS
R01UH0330EJ0200 Rev.2.00 36
Dec 13, 2013
Function Name I/O Function
VDD
⎯
<32-pin, 44-pin, 48-pin, 52-pin>
Positive power supply for all pins
<64-pin >
Positive power supply for P20, P21, P121 to P124, P137 and other than ports
EVDD
⎯
<64-pin>
Positive power supply for ports (other than P20, P21, P121 to P124, P137)
AVREFP Input A/D converter reference voltage (+ side) input
AVREFM Input A/D converter reference voltage (− side) input
VSS
⎯
<32-pin, 44-pin, 48-pin, 52-pin >
Ground potential for all pins
<64-pin>
Ground potential for P20, P21, P121 to P124, P137 and other than ports
EVSS
⎯
<64-pin>
Ground potential for ports (other than P20, P21, P121 to P124, P137)
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
Caution After reset release, the relationships between P40/TOOL0 and the operating mode are as follows.
Table 2-2. Relationships Between P40/TOOL0 and Operation Mode After Reset Release
P40/TOOL0 Operating mode
EVDD Normal operation mode
0 V Flash memory programming mode
For details, see 26.4 Serial Programming Method.
Remark Use bypass capacitors (about 0.1
μ F) as noise and latch up countermeasures with relatively thick wires at
the shortest distance to VDD to VSS and EVDD to EVSS lines.