User's Manual

Target Board for RX231 6. Configuration
R01UHxxxEG0100
Rev.0.60 Page 21 of 28
Nov. 26, 2019
6. Configuration
Modifying the Target Board for RX23W
This section describes how to change the Target Board for RX23W setting by using option link resistance.
An option link resistor is a 0Ω surface mount resistor, which is used to short or isolate a part of circuits. See the
6.2 below for the list of option links by function. Fit or remove the option link resistor to switch functions by
referring to the list. Bold fonts in blue indicates the default configuration at the shipment. For the position of
option links, see the chapter 3 “Part Layout”.
When removing soldered components, do not press a soldering iron on the Target Board for RX23W for more than 5
seconds to avoid any damage around the target area.
Analog Power Supply
The option links for analogue power supply are shown in Table 6-1 and Table 6-2
Table 6-1: 12bit A/D, 12bit D/A Analog Power Supply Option Link
12bit A/D, 12bit D/A
Analog power supply
source
Fit
DNF
Remarks
3.3V on the board
R15, R19
R16, R18
-
MCU Header
R16, R18
R15, R19
The bypass capacitors of C13 are invalid.
Table 6-2: 12bit A/D
Reference Voltage Option Link
12bit A/D Reference
voltage supply source
Fit
DNF
Remarks
3.3V on the board
R14, R17
R20, R21
-
MCU Header
R20, R21
R14, R17
The bypass capacitors of C12 are invalid.
On-chip Oscillator
The option links for on-chip oscillator operation are shown in Table 6-3, Table 6-4.
Table 6-3: HOCO
Option Link
HOCO setting
Fit
DNF
Remarks
Oscillation
R5, R9
R6,R8
-
Stop
R6,R8
R5,R9
Mount a crystal resonator on X1 or X2 and load
capacitance on C8, C9.
Table 6-4: LOCO
Option Link
LOCO setting
Fit
DNF
Remarks
Oscillation
R11
-
-
Stop
-
R11
Mount a crystal resonator on X3 and load
capacitance on C10, C11