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these two signals of jtag interface : tstatus and terror are needed while debugging? I know these two optional pins can be ignored when programming internel flash memory with 4 pins jtag interface(TDI,TDO,TCk,TMS),thanks!
ULINK uses just the standard JTAG signals: TDO, TDI, TMS, TCLK, and RST (for CPU Reset). All other signals are not in use with ULINK. For more information see: http://www.keil.com/appnotes/docs/apnt_177.asp