User's Manual

2.4 RTC
There is a RTC crystal inside the module. It is used for real time counting.
2.5 JTAG
There are 9 JTAG pads in the module. They are for JTAG debugging and reserved
for Sagemcom.
2.6 Peripherals
The peripherals include: ADC, PCM, GPIO, SIM, PWM and two UARTs.
The ADC allows external sensor analog input to the module.
The PCM is the digital audio interface which can be used for digital audio data
communication with host CPU.
The GPIOs are used for controlling external circuits. There are 3 GPIOs in the
module.
The SIM interface is used for SIM card connection. 3V or 1.8V SIM card can be
connected to the module through this interface.
There are two PWMs in the module. PWM0 is dc PWMs and used for external LED
driving. PWM2 is a buzzer PWM and used for driving buzzer.
A V24 full UART is provided in the module. With this UART port, the module can
communicate with other processors.
A two-wire UART is reserved for Sagemcom. It is for debugging.
2.7 Audio subsystem
A single-end audio input signal and a pair of differential audio output signals are
provided in the module. They are used for connecting microphone and receiver.