CY8C24123A
CY8C24223A
CY8C24423A
PSoC Functional Overview
The PSoC family consists of many programmable
Digital System
system-on-chips 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 makes
it possible for you 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 digital system consists of four 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
Port 1
Port 2
Port 0
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 I/O ports that connect
to the global digital and analog interconnects, providing access
to four digital blocks and six analog blocks.
To System Bus
Digital Clocks
From Core
To Analog
System
DIGITAL SYSTEM
Digital PSoC Block Array
Row 0
8
4
8
PSoC Core
8
8
DBB00
DBB01
DCB02 DCB03
The PSoC core is a powerful engine that supports a rich feature
set. The core includes a CPU, memory, clocks, and configurable
GPIOs.
4
The M8C CPU core is a powerful processor with speeds up to
24 Hz, 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).
GIE[7:0]
GIO[7:0]
GOE[7:0]
GOO[7:0]
Global Digital
Interconnect
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.
Digital peripheral configurations are:
■ PWMs (8- and 16-bit)
■ PWMs with dead band (8- and 16-bit)
■ Counters (8- to 32-bit)
The PSoC device incorporates flexible internal clock generators,
including a 24 MHz internal main oscillator (IMO) 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 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.
■ 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)
■ CRC generator (8- to 32-bit)
■ IrDA
■ PRS generators (8- to 32-bit)
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.
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 Table 1 on page 5.
Document Number: 38-12028 Rev. *R
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