User manual

RSK+RX62N 6. Configuration
REJ10J2198-0201 Rev. 2.01 Page 23 of 54
Nov 30, 2011
6. Configuration
6.1 Modifying the RSK
This section lists the option links that are used to modify the way RSK+ operates in order to access different
configurations. Configurations are made by modifying link resistors or headers with movable jumpers or by
configuration DIP switches
A link resistor is a 0Ω surface mount resistor, which is used to short or isolate parts of a circuit. Option links are
listed in the following sections, detailing their function when fitted or removed. Bold, blue text indicates the default
configuration that the RSK+ is supplied with. Refer to the component placement diagram (§3) to locate the option
links, jumpers and DIP switches.
When removing soldered components, always ensure that the RSK is not exposed to a soldering iron for intervals
greater than 5 seconds. This is to avoid damage to nearby components mounted on the RSK.
When modifying a link resistor, always check the related option links to ensure there is no possible signal contention or
short circuits. Because many of the MCU’s pins are multiplexed, some of the peripherals must be used exclusively.
Refer to the RX62N hardware manual and RSK+RX62N board schematics for further information.
6.2 MCU Configuration
Table 6-1 below details the option links associated with configuring the MCU operating modes and emulator
support.
Reference Link Fitted Configuration Link Removed Configuration Related Ref.
R190 Connects RESn (MCU, pin H4) to the
reset IC U10, pin 6.
Connects RESn (MCU, pin H4) to the
reset IC U10, pin 6.
-
R324 Connects EMLE (MCU, pin D1) to
GROUND (via R24), bypassing J1.
Disconnects EMLE (MCU, pin D1)
from GROUND via R24. (Still
connectable via J1),
J1
Table 6-1: MCU Option Links
Table 6-2 below details the function of the jumpers associated with configuring the MCU operating modes, and
emulator support.
Reference Pin 1 Pin 2 Operating Mode Related Ref.
OFF OFF Single chip mode -
ON OFF Boot mode -
OFF ON USB boot mode -
SW4
ON ON DO NOT SET -
Reference Pin 3 Pin 4 Operating Mode Related Ref.
OFF X Big endian -
ON X Little endian -
X OFF USB boot mode bus-powered* J12, J21
SW4
X ON USB boot mode self-powered* J12, J21
Table 6-2: MCU Setting DIP Switches
x – Mode selection is irrespective of this pin changing (i.e. “Don’t care”).
* To configure the device to power from the USB VBUS, see the USB configuration section (§6.7).