EM3581-RTR datasheet(35/59 Pages) SILABS

35 / 59 page

EM358x

Rev 1.0



Instruction cycle count calculation support

Refer to chapter 15 in the

Ember EM358x Reference Manual for more information.

4.7.5. Flash Patch and Breakpoint (FPB)

The EM358x integrates the standard ARM® Flash Patch and Breakpoint (FPB). The FPB implements hardware

breakpoints. The FPB also provides support for remapping of specific instruction or literal locations from flash

memory to an address in RAM memory. The FPB contains:



Two literal comparators for matching against literal loads from flash space, and remapping to a

corresponding RAM space.



Six instruction comparators for matching against instruction fetches from flash space, and remapping to a

corresponding RAM space. Alternatively, the comparators can be individually configured to return a

breakpoint instruction to the processor core on a match, implementing hardware breakpoint capability.

Refer to chapter 16 in the

Ember EM358x Reference Manual for more information.

4.7.6. Serial Wire and JTAG (SWJ) Interface

The EM358x includes a standard Serial Wire and JTAG (SWJ) Interface. The SWJ is the primary debug and

programming interface of the EM358x. The SWJ gives debug tools access to the internal buses of the EM358x,

and allows for non-intrusive memory and register access as well as CPU halt-step style debugging. Therefore, any

design implementing the EM358x should make the SWJ signals readily available.

Serial Wire is an ARM® standard, bi-directional, two-wire protocol designed to replace JTAG, and provides all the

normal JTAG debug and test functionality. JTAG is a standard five-wire protocol providing debug and test

functionality. In addition, the two Serial Wire signals (SWDIO and SWCLK) are overlaid on two of the JTAG signals

(JTMS and JTCK). This keeps the design compact and allows debug tools to switch between Serial Wire and JTAG

as needed, without changing pin connections.

While Serial Wire and JTAG offer the same debug and test functionality, Silicon Labs recommends Serial Wire.

Serial Wire uses only two pins instead of five, and offers a simple communication protocol, high performance data

rates, low power, built-in error detection, and protection from glitches.

The SWJ pins are forced functions, and their corresponding GPIO_PxCFGH/L configurations are overridden when

the EM358x resets.

Refer to chapter 17 in the

Ember EM358x Reference Manual for more information.

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