CY8C24123ACY8C24223A, CY8C24423A
Document Number: 38-12028 Rev. *I Page 2 of 56

PSoC® Functional Overview

The PSoC family consists of many Mixed-Signal Array with
On-Chip Controller devices. These devices are designed to
replace multiple traditional MCU-based system components with
a 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 IO 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 combining all the
device resources into a complete custom system. The PSoC
CY8C24x23A family can have up to three IO ports that connect
to the global digital and analog interconnects, providing access
to 4 digital blocks and 6 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
GPIO (General Purpose IO).
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
11 vectors, to simplify programming of real time embedded
events. Program execution is timed and protected using the
included Sleep and Watchdog Timers (WDT).
Memory encompasses 4 KB of Flash for program storage, 256
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) accurate to
2.5% over temperature and voltage. The 24 MHz IMO can also
be doubled to 48 MHz for use by the digital system. A low power
32 kHz ILO (internal low speed oscillator) 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 generate a system interrupt on high
level, low level, and change from last read.

Digital System

The Digital System consists of 4 digital PSoC blocks. Each block
is an 8-bit resource that may be used alone or combined with
other blocks to form 8, 16, 24, and 32-bit peripherals, which are
called user module references.
Figure 1. Digital System Block Diagram
Digital peripheral configurations are:
■PWMs (8 to 32 bit)
■PWMs with Dead band (8 to 24 bit)
■Counters (8 to 32 bit)
■Timers (8 to 32 bit)
■UART 8 bit with selectable parity
■SPI master and slave
■I2C slave and multi-master (one is available as a System
Resource)
■Cyclical Redundancy Checker/Generator (8 to 32 bit)
■IrDA
■Pseudo Random Sequence Generators (8 to 32 bit)
The digital blocks may be connected to any GPIO through a
series of global buses that can route any signal to any pin. The
buses also allow for signal multiplexing and performing logic
operations. This configurability frees your designs from the
constraints of a fixed peripheral controller.
Digital blocks are provided in rows of four, where the number of
blocks varies by PSoC device family. This gives a choice of
system resources for your application. Family resources are
shown in Tabl e 1 on page 4.
DIGITAL SYSTEM
To System Bus
Digital Clocks
From Core
Digital PSoC Block Array
To Analog
System
8
Row Input
Configuration
Row Output
Configuration
88
8Row 0
DBB00 DBB01 DCB02 DCB03
4
4
GIE[7:0]
GIO[7:0]
GOE[7:0]
GOO[7:0]
Global Digital
Interconnect
Port 2
Port 1
Port 0
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