MCU GPIO pin extension

Due to the insufficient number of I/O ports in low-end MCU, some functions cannot be realized. Users need to use digital integrated chips for expansion, such as the 74LS series shift register. However, this integrated chip may also be unable to ensure sufficient expansion of microcontroller ports due to pin count limitations. Users often use CPLD (such as EPM1270) to expand the corresponding number of ports according to actual needs. The following is a case study of extending IO ports through Altera CPLD.

AG32 series MCU products have built-in CPLD logic inside the chip, which can be flexibly redefined through configuration files for use by MCU and CPLD in the kernel. Therefore, they can provide more GPIO ports than STM32, maximize the utilization of all pin resources, and effectively reduce customer BOM costs.

Program features:
1. AG32 has a maximum clock frequency of 248MHz and a wide range of peripherals, including five UARTs, two I2Cs, and supports various peripheral modules such as USB, CAN, and SPI channels. With its high-speed instruction execution speed, convenient JTAG debugging method, and low power consumption, it provides a relatively complete platform for data collection and processing design.
2. AG32 has a 3x12 bit ADC with a maximum of 3M SPS (17 channels), 2 DACs, and provides two dual channel comparators.
3. AG32 is initially compatible with STM32 pins, but can be flexibly redefined through configuration files for use by MCU and CPLD in the kernel, thus providing more GPIO ports than STM32.
4. The MCU and CPLD of AG32 communicate at high speed through the internal AHB bus of the chip, which is much faster than traditional SPI.
5. AG32 built-in CPLD can achieve customized logic functions for customers.
6. Available in over 32/48/64/100 packages.