JN5148-001-X NXP Semiconductors, JN5148-001-X Datasheet - Page 47

• Manufacturer Part Number: JN5148-001-X
• Description: IC MCU 802.15.4 32BIT 2.4G 56QFN
• Manufacturer: NXP Semiconductors
• Series: JN5148r

Specifications of JN5148-001-X

• Frequency: 2.4GHz
• Data Rate - Maximum: 667kbps
• Modulation Or Protocol: 802.15.4
• Applications: Home/Building Automation, Industrial Control
• Power - Output: 2.5dBm
• Sensitivity: -95dBm
• Voltage - Supply: 2 V ~ 3.6 V
• Current - Receiving: 17.5mA
• Current - Transmitting: 15mA
• Data Interface: PCB, Surface Mount
• Memory Size: 128kB RAM, 128kB ROM
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 56-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 616-1049-2; 935293999531; JN5148-001-X

14 JTAG Debug Interface
The JN5148 includes an IEEE1149.1 compliant JTAG port for the sole purpose of software code debug with Jennic's
Software Development Kit. The JTAG interface is disabled by default and is enabled under software control.
Therefore, debugging is only possible if enabled by the application. Once enabled, the application executes as
normal until the external debugger controller initiates debug activity.
The Debugger supports breakpoints and watchpoints based on four comparisons between any of program counter,
load/store effective address and load/store data. There is the ability to chain the comparisons together. There is also
the ability, under debugger control to perform the following commands: go, stop, reset, step over/into/out/next, run to
cursor and breakpoints. In addition, under control of the debugger, it is possible to:
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The Debugger interface is accessed, depending upon the configuration, through the pins used for UART0 or UART1.
This is enabled under software control and is dealt with in JN-AN-1118 JN5148 Application Debugging [4]. The
following table details which DIO are used for the JTAG interface depending upon the configuration.
If doze mode is active when debugging is started, the processor will be woken and then respond to debugger
commands. It is not possible to wake the device from sleep using the debug interface and debugging is not available
while the device is sleeping.
When using the debug interface, program execution is halted, and control of the CPU is handed to the debugger. The
watchdog, tick timer and the three timers described in section 11 are stalled while the debugger is in control of the
CPU.
When control is handed from the CPU to the debugger or back a small number of CPU clock cycles are taken
flushing or reloading the CPU pipeline. Because of this, when a program is halted by the debugger and then restarted
again, a small number of tick timer cycles will elapse.
It is possible to prevent all hardware debugging by blowing the relevant Efuse bit.
The JTAG interface does not support boundary scan testing. It is recommended that the JN5148 is not connected as
part of the board scan chain.
© NXP Laboratories UK 2010
Read and write registers on the wishbone bus
Read ROM and RAM, and write to RAM
Read and write CPU internal registers
Signal
data out (TDO)
control (TMS)
data in (TDI)
clock (TCK)
Table 4 Hardware Debugger IO
JN-DS-JN5148-001 1v6
UART0 pins
4
5
6
7
DIO Assignment
UART1 pins
17
18
19
20
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