Pmod Tm Connectivity; Wm8983 Codec; Power Supply - Renesas RX231 User Manual

Hear-it! Solution Kit
TM
4.2.5 PMOD Connectivity
The Hear-it! Solution kit is distributed with a 128x128 colour display, driven from the PMOD
Communications between the MCU (IC7) and the PMOD
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
TM
for the PMOD 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
CN2 PMOD
Pin
1
2
3
4
7
8
9
10
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.
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.
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
The RX231 MCU is supplied through header JP1/R12, to allow the current consumption of the RX231 MCU to
be evaluated.
R12UZ0012EG0110 Rev. 1.10
Apr 03, 2017
TM
standard.
Vcc
0V
SCK
RX
TX
Enable
Figure 4-3 : Connection Diagram for PMOD
Function
Enable (Chip Select)
(Active Low)
TX
RX (Not used on display)
SCK
Not used on display
Reset
Data/Cmd
Backlight
Table 4-2 : Connection Details for PMOD
TM
display are made by the on-board SCI9 peripheral,
6 12 Vcc
5 11 0V
4 10 Backlight
3 9 Data/Cmd
2 8 Reset
1 7 Not Used
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IC7 MCU Pin IC7 MCU Port/Pin,
function
17 P33, I/O
53 PB7, SCI9 TX
54 PB6, Not Used
55 PB5, SCI9 SCK
72 PE6, Not Used
71 PE7, I/O
75 PE3, I/O
74 PE4, I/O
TM
TM
and CODEC is provided by regulator IC1.
4
TM
display on CN2
Schematic
Signal
PMOD_CS
TXD9
RXD9
SCK9
IRQ6
IRQ7
PE3
PE4
Display on CN5
Hardware Design
connector on CN2.
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