October 26, 2006
Document No. 38-12012 Rev. *K
2
CY8C27x43 Final Data Sheet
PSoC® Overview
processor. The CPU utilizes an interrupt controller with 17 vec-
tors, to simplify programming of real time embedded events.
Program execution is timed and protected using the included
Sleep and Watch Dog Timers (WDT).
Memory encompasses 16K of Flash for program storage, 256
bytes of SRAM for data storage, and up to 2K of EEPROM
emulated using the Flash. Program Flash utilizes four protec-
tion levels on blocks of 64 bytes, allowing customized software
IP protection.
The PSoC device incorporates flexible internal clock genera-
tors, 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 desired, the
ECO (32.768 kHz external crystal oscillator) is available for use
as a Real Time Clock (RTC) and can optionally generate a crys-
tal-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 interfac-
ing. Every pin also has the capability to generate a system inter-
rupt on high level, low level, and change from last read.
The Digital System
The Digital System is composed of 8 digital PSoC blocks. Each
block is an 8-bit resource that can be used alone or combined
with other blocks to form 8, 16, 24, and 32-bit peripherals, which
are called user module references.
Digital System Block Diagram
Digital peripheral configurations include those listed below.
■ PWMs (8 to 32 bit)
■ PWMs with Dead band (8 to 32 bit)
■ Counters (8 to 32 bit)
■ Timers (8 to 32 bit)
■ UART 8 bit with selectable parity (up to 2)
■ SPI slave and master (up to 2)
■ I2C slave and multi-master (1 available as a System
Resource)
■ Cyclical Redundancy Checker/Generator (8 to 32 bit)
■ IrDA (up to 2)
■ Pseudo Random Sequence Generators (8 to 32 bit)
The digital blocks can 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 for performing logic
operations. This configurability frees your designs from the con-
straints of a fixed peripheral controller.
Digital blocks are provided in rows of four, where the number of
blocks varies by PSoC device family. This allows you the opti-
mum choice of system resources for your application. Family
resources are shown in the table titled “PSoC Device Charac-
teristics” on page 3.
The Analog System
The Analog System is composed of 12 configurable blocks,
each comprised of an opamp circuit allowing the creation of
complex analog signal flows. Analog peripherals are very flexi-
ble and can be customized to support specific application
requirements. Some of the more common PSoC analog func-
tions (most available as user modules) are listed below.
■ Analog-to-digital converters (up to 4, with 6- to 14-bit resolu-
tion, selectable as Incremental, Delta Sigma, and SAR)
■ Filters (2, 4, 6, and 8 pole band-pass, low-pass, and notch)
■ Amplifiers (up to 4, with selectable gain to 48x)
■ Instrumentation amplifiers (up to 2, with selectable gain to
93x)
■ Comparators (up to 4, with 16 selectable thresholds)
■ DACs (up to 4, with 6- to 9-bit resolution)
■ Multiplying DACs (up to 4, with 6- to 9-bit resolution)
■ High current output drivers (four with 30 mA drive as a Core
Resource)
■ 1.3V reference (as a System Resource)
■ DTMF Dialer
■ Modulators
■ Correlators
■ Peak detectors
■ Many other topologies possible
DIGITAL SYSTEM
To System Bus
DigitalClocks
FromCore
Digital PSoC Block Array
ToAnalog
System
8
8
8
8
Row 1
DBB10
DBB11
DCB12
DCB13
4
4
Row 0
DBB00
DBB01
DCB02
DCB03
4
4
GIE[7:0]
GIO[7:0]
GOE[7:0]
GOO[7:0]
Global Digital
Interconnect
Port 4
Port 3
Port 2
Port 1
Port 0
Port 5
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