CY8C52 CYPRESS [Cypress Semiconductor], CY8C52 Datasheet - Page 51

• Manufacturer Part Number: CY8C52
• Description: Programmable System-on-Chip (PSoC)
• Manufacturer: CYPRESS [Cypress Semiconductor]

9. Programming, Debug Interfaces,
The Cortex-M3 has internal debugging components, tightly
integrated with the CPU, providing the following features:
PSoC devices include extensive support for programming,
testing, debugging, and tracing both hardware and firmware.
Four interfaces are available: JTAG, SWD, SWV, and
TRACEPORT. JTAG and SWD support all programming and
debug features of the device. JTAG also supports standard JTAG
scan chains for board level test and chaining multiple JTAG
devices for programming or testing. The SWV and TRACEPORT
provide trace output from the DWT, ETM, and ITM.
TRACEPORT is faster but uses more pins. SWV is slower but
uses only one pin.
Cortex-M3 debug and trace functionality enables full device
debugging in the final system using the standard production
device. It does not require special interfaces, debugging pods,
simulators, or emulators. Only the standard programming
connections are required to fully support debug.
The PSoC Creator IDE software provides fully integrated
programming and debug support for PSoC devices. The low cost
MiniProg3 programmer and debugger is designed to provide full
programming and debug support of PSoC devices in conjunction
with the PSoC Creator IDE. PSoC JTAG, SWD, and SWV inter-
faces are fully compatible with industry standard third party tools.
All Cortex-M3 debug and trace modules are disabled by default
and can only be enabled in firmware. If not enabled, the only way
to reenable them is to erase the entire device, clear Flash
protection, and reprogram the device with new firmware that
enables them. Disabling debug and trace features, robust Flash
protection, and hiding custom analog and digital functionality
inside the PSoC device provide a level of security not possible
with multichip application solutions. Additionally, all device inter-
faces can be permanently disabled (Device Security) for applica-
tions concerned about phishing attacks due to a maliciously
reprogrammed device. Permanently disabling interfaces is not
recommended in most applications because the designer then
cannot access the device. Because all programming, debug, and
test interfaces are disabled when Device Security is enabled,
PSoCs with Device Security enabled may not be returned for
failure analysis.
Document Number: 001-55034 Rev. *A
JTAG or SWD access
Flash Patch and Breakpoint (FPB) block for implementing
breakpoints and code patches
Data Watchpoint and Trigger (DWT) block for implementing
watchpoints, trigger resources, and system profiling
Embedded Trace Macrocell (ETM) for instruction trace
Instrumentation Trace Macrocell (ITM) for support of printf-style
debugging
Resources
PRELIMINARY
9.1 JTAG Interface
The IEEE 1149.1 compliant JTAG interface exists on four or five
pins (the nTRST pin is optional). The JTAG clock frequency can
be up to 8 MHz. By default, the JTAG pins are enabled on new
devices but the JTAG interface can be disabled, allowing these
pins to be used as General Purpose I/O (GPIO) instead. The
JTAG interface is used for programming the Flash memory,
debugging, I/O scan chains, and JTAG device chaining.
9.2 SWD Interface
The SWD interface is the preferred alternative to the JTAG
interface. It requires only two pins instead of the four or five
needed by JTAG. SWD provides all of the programming and
debugging features of JTAG at the same speed. SWD does not
provide access to scan chains or device chaining.
SWD uses two pins, either two of the JTAG pins (TMS and TCK)
or the USBIO D+ and D- pins. The USBIO pins are useful for in
system programming of USB solutions that would otherwise
require a separate programming connector. One pin is used for
the data clock and the other is used for data input and output.
SWD can be enabled on only one of the pin pairs at a time. This
only happens if, within 8 µs (key window) after reset, that pin pair
(JTAG or USB) receives a predetermined sequence of 1s and 0s.
SWD is used for debugging or for programming the Flash
memory.
The SWD interface can be enabled from the JTAG interface or
disabled, allowing its pins to be used as GPIO. Unlike JTAG, the
SWD interface can always be reacquired on any device during
the key window. It can then be used to reenable the JTAG
interface, if desired. When using SWD or JTAG pins as standard
GPIO, make sure that the GPIO functionality and PCB circuits do
not interfere with SWD or JTAG use.
9.3 Debug Features
The CY8C52 supports the following debug features:
Halt and single-step the CPU
View and change CPU and peripheral registers, and RAM
addresses
Six program address breakpoints and two literal access break-
points
Data watchpoint events to CPU
Patch and remap instruction from Flash to SRAM
Debugging at the full speed of the CPU
Debug operations are possible while the device is reset, or in
low power modes
Compatible with PSoC Creator and MiniProg3 programmer and
debugger
Standard JTAG programming and debugging interfaces make
CY8C52 compatible with other popular third-party tools (for
example, ARM / Keil)
PSoC
®
5: CY8C52 Family Data Sheet
Page 51 of 85
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