User manual

RSKR8CLA8A 6. Configuration
R20UT0284EG0101 Rev. 1.01 Page 17 of 34
Jun 16, 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.
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 and jumpers.
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 R8C/LA8A hardware manual and RSK R8C/LA8A board schematics for further information.
6.2 MCU Configuration
Table 6-1 below details the different configurations and functions of the MCU operating mode jumpers.
Reference Position One Position Two Related Ref.
J6 Pins 1 and 2 shorted.
Connects MODE pin to
ground. MCU operates in
Standard Serial I/O Mode
(Boot mode).
All pins open. MODE pin
is pulled up by resistor
R63. MCU operates in
single chip mode.
--
Table 6-1: MCU Operating Mode Jumpers
6.3 RS232 Serial Port Configuration
Table 6-2 below details the function of the option links associated with the serial port configuration.
Reference Link Fitted Configuration Link Removed Configuration Related Ref.
R66 Places the RS-232 Transceiver in a
power-down mode.
Places the RS-232 Transceiver in a
power-up mode.
-
R67 Disables the RS-232 Transceiver. Enables the RS-232 Transceiver -
R69 Connects the RS232 serial port (Tx) to
the application board interface (JA6-5).
Disconnects the RS232 serial port
(Tx) from application board
interface (JA6-5).
R71, R73
R70 Connects the RS232 serial port (Rx) to
the application board interface (JA6-6)
Disconnects the RS232 serial port
(Rx) from application board
interface (JA6-6)
R72, R74
Table 6-2: Serial Port Option Links (Continued Overleaf)