Data Sheet

GPIO and interfaces

Every GPIO can be conﬁgured as Input, Output and Interrupt, and can also be conﬁgured

as weak pull-up, strong pull-up, weak pull-low or ﬂoating mode.

Except ADC, all interfaces are possible to map to different GPIOs by software. The

interface including:

1. I2C: it supports 100KHz and 400KHz modes, 7-bit and 10-bit address

2. I2S: either master or slave mode can be enabled

3. UART: Asynchronous Rx/Tx, up to almost 1Mbps, supports parity and 9 bit-data

4. PWM: 6 channels PWM is multiplex with GPIO, and the frequency is base on the main

clock (16MHz) as the following equation:

Freq_PWM=16MHz/(N_prescaler x N_top_count);

where the value in N_top_count register controls the frequency

and the Duty cycle is controlled by the following equation:

Duty_cycle_PWM=N_threshold/N_top_count

where the value in N_threshold, together with N_top_count, control

the duty cycle

5. Quadrature decoder: it can interface and decode signal from quadrature-encoded

sensor, both mechanical and optical sensors. Input debounce ﬁlters is included.

6. Keyscan: it supports up to 16 rows by 18 columns key matrix. Multi-key-press support

and de-bounce time is conﬁgurable.

7. Analog to Digital converter (ADC) : Up to 10 12-bit SAR ADC, and two inputs are with

PGA, which provides a software conﬁgurable 0 to 42dB with 3dB steps.

8. PGA provides 42dB gain range from 0dB to 42dB in 3dB steps.

PRBMD02 DATASHEET 1.10

K-SOLUTION