Cypress PSoC 4000 Series

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PSoC 4000 Family: PSoC 4 Architecture TRM, Document No. 001-89309 Rev. *D 145

Program and Debug Interface

rect CM0 DAP SWDID is read from the target device. For

the debug transactions to occur on the SWD interface, the

corresponding pins should not be used for any other pur-

pose. See the I/O System chapter on page 45 to understand

how to configure the SWD port pins, allowing them to be

used only for SWD interface or for other functions such as

GPIO. If debugging is required, the SWD port pins should

not be used for other purposes. If only programming support

is needed, the SWD pins can be used for other purposes.

When the SWD port is acquired, the external debugger sets

the C_DEBUGEN bit in the DHCSR register to enable

debugging. Then, the different debugging operations such

as stepping, halting, breakpoint configuration, and watch-

point configuration are carried out by writing to the appropri-

ate registers in the debug system.

Debugging the target device is also affected by the overall

device protection setting, which is explained in the Device

Security chapter on page 79. Only the OPEN protected

mode supports device debugging. The external debugger

and the target device connection is not lost for a device tran-

sition from Active mode to either Sleep or Deep-Sleep

modes. When the device enters the Active mode from either

Deep-Sleep or Sleep modes, the debugger can resume its

actions without initiating a connect sequence again.

18.7 Registers

Table 18-5. List of Registers

CM0_DHCSR Debug Halting Control and Status Register

CM0_DFSR Debug Fault Status Register

CM0_DCRSR Debug Core Register Selector Register

CM0_DCRDR Debug Core Register Data Register

CM0_DEMCR Debug Exception and Monitor Control Register

CM0_BP_CTRL Breakpoint control register

CM0_BP_COMPx Breakpoint Compare Register

CM0_DWT_COMPx Watchpoint Compare Register

CM0_DWT_MASKx Watchpoint Mask Register

CM0_DWT_FUNCTIONx Watchpoint Function Register

CM0_DWT_PCSR Watchpoint Comparator PC Sample Register

Cypress PSoC 4000 Series - Registers