User's Manual

EK-RA4W1 5. User Circuits
R20UT4683EJ0100 Rev.0.90 Page 20 of 30
Apr.28.20
5.11 Current Measurement Header
The current measurement header (J7) is used to measure the current drawn by the evaluation MCU (an actual
header component is not mounted on the board as shipped). The current drawn can be measured by
connecting an ammeter to the evaluation MCU. When this header is to be used, remove the relevant pattern
for cutting (SS20) on the soldered side. Figure 5-7 shows the positions of the header and pattern for cutting.
Current
measurement
header (J7)
Pattern for
cutting (SS20)
Figure 5-7 Positions of the Current Measurement Header (J7) and Pattern for Cutting (SS20)
(Soldered Side)
5.12 MCU Headers
MCU headers are provided for by two sets of through holes (CN7 and CN8) for 28-pin headers (actual header
components are not mounted on the board as shipped). The pin headers have a pitch of 2.54 mm and are
connected to the evaluation MCU. Pin numbers of the MCU headers correspond to those of the evaluation
MCU, and most pins are connected (with pins 2, 5, 6, 11, 28, 30, 33, 34, 39, 41, 42, 43, 45, and 48 as the
exceptions).
5.13 Reset Switch
Pressing the RESET switch applies a hardware reset to the evaluation MCU.
5.14 User Switch
An optional user switch (SW1) is mounted. It is connected to pin 44 of the evaluation MCU, which operates as
pin function P402. The IRQ4 interrupt is multiplexed on the same pin.
5.15 Patterns for Cutting
Patterns must be cut or repaired by soldering if necessary. Figure 5-8 shows examples of the states of
patterns for cutting.
Soldered
Connected Removed
Restored by soldering
Figure 5-8 Examples of States of Patterns for Cutting