Cypress Semiconductor CY8C21534 Dokumentacja Pobierz pdf (Strona 26)

5 Microcontroller Environment of the Electronic Class Schedule

5.1 Functional Division of Microcontrollers

In this project two types of PSoC MCUs were used due to the fact that the MCU

needed for the capacitive touch sensing did not have enough digital blocks to manage

both the capacitive touch and the communication functionality. For the duration of this

thesis work they will be referred to as the Control MCU and the Communications MCU.

The PSoC microcontroller used for the Control MCU is a CY8C21534. This PSoC was

chosen to take care of the capacitive touch buttons and the management of power for

the digital photo frame and the Communications MCU. This processor type works with

a settings wizard in the PSoC Designer software that creates capacitive touch pad

settings for the user. For the management of power in the system, this model has

enough I/O pins to use it to gate several transistors for power flow control in critical

areas. It has a processor speed of 24 MHz and operates from 2.4 volts to 5.25 volts. It

contains 8 KB of flash memory and 512 bytes of static random access memory. This

module provides the normal PSoC function blocks such as Pulse Width Modulators

(PWM), ADCs, counters, timers, UART, and SPI. It also has the option to utilize up to

20 of the input/output ports as capacitive sensing and proximity sensing. [13.]

The Communications MCU is a PSoC type CY8C29466. The capability of this

microcontroller to have up to 16 digital blocks is why it was chosen to control the WiFly

and SD card communications. It has a processor speed of 24 MHz, 32 KB of flash

memory, and 2 KB of static random access memory. It can have 12 analogue inputs,

four analogue outputs, or up to 44 digital input/output ports. [14.]

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Cypress Semiconductor CY8C21534 Dokumentacja Strona 26