78K0/Lx3

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FAQ NO : 1005533 Issue Date : Dec.01.11 Functions : Clock In the uPD780031A, the minimum instruction execution time is described as being changeable between high speed (0.4μs) and low speed (1.6μs). How can the minimum instruction execution time be changed? The instruction execution time can be changed by switching the CPU's operating clock using the PCC register. Relevant Products 78K Family UPD78003xA
FAQ NO : 1005164 Issue Date : Dec.01.11 Functions : Pin In the uPD780308, when input pins and output pins are mixed in the same port and the on-chip pull-up resistor is set to ON, does this cause interference with the output pin side? No, this does not cause interference. (There is no problem.) As can be seen in the port block diagram, the pull-up resistor of each port can only be enabled by setting the PUO register to 1 and also setting the PM register to 1 (in other words, inpu... Relevant Products RL78 Family 78K Family
FAQ NO : 1005161 Issue Date : Dec.01.11 Functions : Pin Regarding the DC characteristics of the uPD780021A Data Sheet, what is the MAX value of the output voltage when VDD is 1.8V (IoL = approx. 500μA) for the pins in the bottom cell (P00 to 03, etc.)? In a small-current area of this level, the output voltage can be considered to be almost proportional to the output current. Therefore, since the voltage is 0.5V at 400μA, it is considered to rise 0.125V at 500μA, becoming approximately 0.63V. If th... Relevant Products RL78 Family 78K Family
FAQ NO : 1009249 Issue Date : Dec.01.11 Functions : Emulator Please describe in detail the real-time RAM sampling function of the ID78K4-NS. The basic use is to simply open the memory window or variable window. When the program is executed in this state, the contents sampled at regular time intervals are displayed in the window. Since this function is valid only for the internal RAM area,... Relevant Products 78K Family
FAQ NO : 1009248 Issue Date : Dec.01.11 Functions : Emulator When step execution is performed after starting up the debugger from the Project Manager, the following error is displayed. There is no problem in the source path setting. "Could not find PC location line information." An error is output because there is no source for the current program counter PC (= 0000). If describing the source with assembler, the start address must be set to the address 0000H reset vector table (indicated with the * mark below). As a result, ... Relevant Products 78K Family
FAQ NO : 1009247 Issue Date : Dec.01.11 Functions : Emulator Please describe the function to detect stack-over in the ICE. Stack-over detection is enabled by setting "stack" for the memory attribute in the configuration dialog box. (Reference) ID78K4 User's Manual Debug window Configuration dialog box Moreover, to test the size actually consumed as the stack, fill the ... Relevant Products 78K Family
FAQ NO : 1009246 Issue Date : Dec.01.11 Functions : Emulator What should be set for the memory mapping in the configuration dialog box displayed at debugger startup? This is an item specified when using a memory other than the internal memory of the device (when using externally connected memory, or when using ROM/RAM emulation memory in the ICE). Nothing need be specified when using just the device's internal me... Relevant Products 78K Family
FAQ NO : 1009245 Issue Date : Dec.01.11 Functions : Emulator Are there differences in the microcontroller functions (existence of internal pull-up resistor selection, etc.) between the IE-780078-NS-EM1 and the D78F0078? Regarding the internal pull-up resistor, the P30 to P33 mask option resistors are emulated with the ICE, but these resistors as mask options and are not included in the flash version. However, there are no differences regarding pull-up resistors con... Relevant Products 78K Family
FAQ NO : 1003607 Issue Date : Dec.01.11 Functions : Low Power Architecture , Interrupt/Exception Handling An SFR illegal break occurs after the STOP mode is entered by execution of the 78K4 standby command (STBC) upon recovery from the standby status. There seems to be a problem with the STOP release method. STOP mode can be released either by generating a vectored interrupt (the CPU is in the interrupt-enabled status) or without generating a vectored interrupt (the CPU is in the interrupt-disab... Relevant Products RL78 Family 78K Family UPD784xxx
FAQ NO : 1003599 Issue Date : Dec.01.11 Functions : I/O Port In the uPD78421x, the port I/O status can be set using the port mode register. Is it necessary to set the port mode register even when using port alternate functions? (Address bus, data bus, UART, BUZ, etc.) Yes, this is basically correct. However, regarding the external bus, the function is switched to address bus or data bus by setting the MM register. So the port mode settings are not required. When using UART, the mode of the ports corresponding to T... Relevant Products RL78 Family 78K Family UPD78421x

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