CY8C5246AXI-038 Cypress Semiconductor Corp, CY8C5246AXI-038 Datasheet - Page 46

• Manufacturer Part Number: CY8C5246AXI-038
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY8C5246AXI-038

• Lead Free Status / RoHS Status: Compliant

8.7.1 Current DAC
The IDAC can be configured for the ranges 0 to 32 µA, 0 to 256
µA, and 0 to 2.048 mA. The IDAC can be configured to source
or sink current.
8.7.2 Voltage DAC
For the VDAC, the current DAC output is routed through
resistors. The two ranges available for the VDAC are 0 to
1.024 V and 0 to 4.096 V. In voltage mode any load connected
to the output of a DAC should be purely capacitive (the output of
the VDAC is not buffered).
9. Programming, Debug Interfaces,
The Cortex-M3 has internal debugging components, tightly
integrated with the CPU, providing the following features:
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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
interfaces 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
interfaces can be permanently disabled (Device Security) for
applications concerned about phishing attacks due to a
maliciously reprogrammed device. Permanently disabling
Document Number: 001-55034 Rev. *G
JTAG or SWD access
FPB block for implementing breakpoints and code patches
DWT block for implementing watchpoints, trigger resources,
and system profiling
ETM for instruction trace
ITM for support of printf-style debugging
Resources
PRELIMINARY
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.
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, or 1/3 of the CPU clock frequency for 8 and 16-bit
transfers, or 1/5 of the CPU clock frequency for 32-bit transfers,
whichever is least. 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. The SWD
clock frequency can be up to 1/3 of the CPU clock frequency.
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:
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Halt and single-step the CPU
View and change CPU and peripheral registers, and RAM
addresses
Six program address breakpoints and two literal access
breakpoints
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
PSoC
®
5: CY8C52 Family Datasheet
Page 46 of 85
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