Renesas RX231, User Manual

Page: 16 / 34

Hear-it! Solution Kit 4 Hardware Design
R12UZ0012EG0110 Rev. 1.10 Page 16 of 34
Apr 03, 2017
4.2.5 PMOD
TM
Connectivity
The Hear-it! Solution kit is distributed with a 128x128 colour display, driven from the PMOD
TM
connector on CN2.
Communications between the MCU (IC7) and the PMOD
TM
display are made by the on-board SCI9 peripheral,
in SPI transmit only mode, plus various other signals to manage device select, reset and backlight control.
The connection of the display to the microcontroller is shown in Figure 4-3 and Table 4-2. Note that the pinout
for the PMOD
TM
connector is not made in the standard fashion of left to right ascending, but ascending on the
left then on the right, as per the PMOD
TM
standard.
Vcc
0V
Backlight
Data/Cmd
Reset
Not Used
Vcc
0V
SCK
RX
TX
Enable
6
5
4
3
2
1
12
11
10
9
8
7
Figure 4-3 : Connection Diagram for PMOD
TM
display on CN2
CN2 PMOD
TM
Pin
Function IC7 MCU Pin IC7 MCU Port/Pin,
function
Schematic
Signal
1 Enable (Chip Select)
(Active Low) 17 P33, I/O PMOD_CS
2 TX 53 PB7, SCI9 TX TXD9
3 RX (Not used on display) 54 PB6, Not Used RXD9
4 SCK 55 PB5, SCI9 SCK SCK9
7 Not used on display 72 PE6, Not Used IRQ6
8 Reset 71 PE7, I/O IRQ7
9 Data/Cmd 75 PE3, I/O PE3
10 Backlight 74 PE4, I/O PE4
Table 4-2 : Connection Details for PMOD
TM
Display on CN5
4.2.6 WM8983 CODEC
The Hear-it! Solution Kit board incorporates a Cirrus Logic WM8983 Stereo CODEC with speaker driver. This
provides Line-In and MIC inputs and outputs for a headphone and speaker (up to 1W). The MIC input connector
CN8 is not fitted by default on the PCB. If it is required then the recommended part is SJ-3506-SMT-TR from
CUI. Audio data is transferred to and received from the RX231 MCU by SSI interface, and a separate SPI
connection is used to configure the CODEC, on SCI8 of the RX231 MCU.
The audio clock for the CODEC is a 12.288MHz oscillator, OSC1, which is also fed to the RX231 MCU on pin
16, P34 for the SSI interface.
4.2.7 Power Supply
The Hear-it! Solution Kit can be powered either from the embedded programmer/debugger USB-mini function
connector CN4, or by a 5V supply connected to CN1, with a standard centre-positive barrel connector. The
connection from CN1 is intended to provide the lowest noise solution. No modification or configuration is
required to use either source. A 3.3V supply for the MCU, PMOD
TM
and CODEC is provided by regulator IC1.
The RX231 MCU is supplied through header JP1/R12, to allow the current consumption of the RX231 MCU to
be evaluated.
Caution:
Headphones should be connected to the 3.5mm line-out connector CN5. Connector CN6 is designed to
connect to a speaker only. It is not recommended to attach headphones to speaker connection CN6, as
damage to the headphones may occur.