CY8C22545-24AXIT

PSoC Functional Overview

The PSoC family consists of many On-Chip Controller devices.

These devices are designed to replace multiple traditional MCU-based system components with one low cost single-chip programmable device. PSoC devices include configurable blocks of analog and digital logic, and programmable interconnects. This architecture enables the user to create customized peripheral configurations that match the requirements of each individual application. Additionally, a fast

CPU, Flash program memory, SRAM data memory, and configurable I/O are included in a range of convenient pinouts and packages.

The PSoC architecture, shown in Figure 1, consists of four main areas: PSoC Core, Digital System, Analog System, and System Resources. Configurable global busing allows the combining of all the device resources into a complete custom system. The PSoC family can have up to five I/O ports connecting to the global digital and analog interconnects, providing access to eight digital blocks and six analog blocks.

PSoC Core

The PSoC Core is a powerful engine that supports a rich feature set. The core includes a CPU, memory, clocks, and configurable

general-purpose I/O (GPIO).

The M8C CPU core is a powerful processor with speeds up to 24 MHz, providing a four MIPS 8-bit Harvard architecture microprocessor. The CPU uses an interrupt controller with 21 vectors, to simplify the programming of real time embedded events.

Program execution is timed and protected using the included Sleep and watchdog timers (WDT).

Memory encompasses 16 KB of Flash for program storage, 1 K bytes of SRAM for data storage, and up to 2 KB of EEPROM emulated using the Flash. Program Flash uses four protection levels on blocks of 64 bytes, allowing customized software IP protection.

The PSoC device incorporates flexible internal clock generators, including a 24 MHz IMO (internal main oscillator). The 24 MHz IMO can also be doubled to 48 MHz for use by the digital system.

A low power 32 kHz internal low-speed oscillator (ILO) is provided for the Sleep timer and WDT. If crystal accuracy is required, the ECO (32.768 kHz external crystal oscillator) is available for use as a Real Time Clock (RTC), and can optionally generate a crystal-accurate 24 MHz system clock using a PLL.

The clocks, together with programmable clock dividers (as a System Resource), provide the flexibility to integrate almost any timing requirement into the PSoC device. 

PSoC GPIOs provide connection to the CPU, digital, and analog resources of the device. Each pin’s drive mode may be selected from eight options, allowing great flexibility in external interfacing. Every pin can also generate a system interrupt on high level, low level, and change from last read.