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XC2200 Datasheet(PDF) 49 Page - Infineon Technologies AG |
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XC2200 Datasheet(HTML) 49 Page - Infineon Technologies AG |
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49 / 62 page  XC2200 Derivatives XC2000 Family / Alpha Line Detailed Errata Description Errata Sheet 49 V1.11, 2014-10 INT_X.H004 SCU Interrupts Enabled After Reset Following a reset, the SCU interrupts are enabled by default (register SCU_INTDIS = 0000 H). This may lead to interrupt requests being triggered in the SCU immediately, even before user software has begun to execute. In the SCU, multiple interrupt sources are `ORed` to a common interrupt node of the CPU interrupt controller. Due to the “ORing” of multiple interrupt sources, only one interrupt request to the interrupt controller will be generated if multiple sources at the input of this OR gate are active at the same time. If user software enables an interrupt in the interrupt controller (SCU_xIC) which shares the same node as the SCU interrupt request active after reset, it may lead to the effect of suppressing the intended interrupt source. So, for all SCU interrupt sources which will not be used, make sure to disable the interrupt source (SCU_INTDIS) and clear any pending request flags (SCU_xIC.IR) before enabling interrupts in interrupt controller. JTAG_X.H001 JTAG Pin Routing In the current device, the pins connected to the JTAG interface can be selected by software (write to register DBGPRR). After a reset, the JTAG interface is connected to position A (see Table 8). If connected to these pins, the debugger will work without any restrictions. To use other pins for the JTAG interface, the following sequence of steps must be executed: • TRST must be high at the rising edge of PORST. Usually debuggers provide that. • Debuggers must be set to do a so called `hot attach`. This is connecting the microcontroller without executing a reset. • Execute a write to DBGPRR register with the desired selection of pins to be used with one of the first instructions out of Flash. Table 8 JTAG Position A Pin LQFP-100 Pin LQFP-144 Symbol Signal 23 34 P5.2 TDI_A 68 P7.0 TDO_A 57 82 P2.9 TCK_A 28 39 P5.4 TMS_A 56 TRST TRST |
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