Chapter 6. User Circuitry
6.1. Switches
There are four switches located on the RDK board. The function of each switch and its connection are shown in Table
Switch
SWITCH 1
SWITCH 2
SWITCH 3
RESET
Function
Connects to an interrupt line for user controls.
Connects to an interrupt line for user controls.
Connects to an interrupt line for user controls.
When pressed, the RL78 is reset.
RL78
INTP0 , P137 (pin 9)
INTP1 , P50 (pin 33)
INTP2 , P51 (pin 34)
/RESET , (pin 6)
Table 6-1: Switch Functions
6.2.Debug LCD Module
A debug LCD module is supplied on the RDK. The debug LCD module uses an SPI interface to reduce the pin allocation.
Software contrast control is also provided. The module supplied with the RDK uses 3.3v. The display is a 96 x 64
graphics display and uses a white LED backlight. The backlight is on by default and can be toggled OFF by setting P70
(BL-ENA) low. Note there is a footprint, LCD1, for a 2 x 8 character display. This display is not populated – but can be
used in a standard 4 bit nibble configuration if desired. Table 6-2 shows the pin allocation and signal names used for the
graphics LCD connector.
Pin
1
3
5
7
9
11
13
15
17
19
Circuit Net Name
+5V Backlight Positive Anode
GND
GND
RSTOUT#
+3.3V
SCK
MOSI
+3.3V
+3.3V
GND
RL78
-
-
-
P130 (pin 57)
-
P04 (pin 58)
P02 (pin 60)
-
-
-
Pin
2
4
6
8
10
12
14
16
18
20
GND
GND
LCD-CS
LCD-RS
+3.3V
MOSI
MOSI
+3.3V
+3.3V
+3.3V
Circuit Net Name
RL78
-
-
P10 (pin 46)
P15 (pin 41)
-
P02 (pin 60)
P02 (pin 60)
-
-
-
Table 6-2: Debug LCD Module Connections (J8)
10
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