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6.6. Audio (Audio Out, Mic, Speaker, Volume Potentiometer)
An amplified stereo audio output jack is provided and connected to the timer circuit.
TIOCA8A is used for Right audio channel and comes out
on CPU pin 64. TIOC8B is used for the Left audio channel and comes out on CPU pin 63.
The stereo amp is powered by a National Semi
LM4808.
An on-board Analog Devices Inc. (ADI) Silicon microphone (ADMP401) is connected to the ADC channel AN5 (CPU pin 89) using
an ADI SSM2167 low voltage Microphone preamplifier.
A single turn potentiometer is connected to the ADC channel AN4 (CPU pin 90) of
the microcontroller. This may be used to vary the input analog voltage value to this pin between 3V3A and Ground. The potentiometer is used
as a volume control in the Demo Application.
Note that the default is to have JP7, SPK EN, fitted.
This enables the on-board Star Micronics
speaker.
Removing this jumper disables the on-board speaker.
Remove the jumper to use the headphone audio jack.
As of hardware
revision 6, the on-board speaker is now powered by a LM4889 audio power amplifier to increase volume output. The amplifier can be disabled
by setting PE7 low.
Note : The potentiometer is fitted to offer an easy way of supplying a variable analog input to the controller. It does not necessarily reflect the
accuracy of the controllers ADC. Please see the device manual for details.
6.7. Serial port
The Serial module allows the MCU to communicate to a Host PC through the RS-232 connector, J5, using RS232Rx and RS232Tx. The serial
port is configured in DCE mode allowing direct connection to a PC without a Null modem. The serial module can also be used as a serial
debug port.
Table 6-4 contains details of the specific pin functions and their locations.
Description
TXD2
RXD2
Function
Serial Transmission Pin
Serial Reception Pin
MCU Pin
44
42
Connector Pin
J5.2
J5.3
Table 6-4: Serial port pin details
6.8. RCAN
The RCAN module can be controlled by the MCU through the CTx0 (Port pin P32) and CRx0 (Port pin P33) lines, or controlled externally
through the header connections CTx0 and CRx0.
The Table 6-5 contains details of the specific pin functions and their locations.
Note that
an 8 pin Renesas R2A25416SP CAN transceiver is fitted to the board.
Description
CTx0
CRx0
Function
RCAN Transmission Pin
RCAN Reception Pin
MCU Pin
18
17
Header Pin
CAN High J6.1
CAN Low J6.3
Table 6-5: RCAN port pin details
6.9. USB
The USB module can be configured as Host, Device or OTG with the correct switch settings on SW6.
12
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