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C161 Datasheet(PDF) 184 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 184 Page - Infineon Technologies AG |
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184 / 400 page  &3, 7KH([WHUQDO%XV ,QWHUIDFH User’s Manual 9-20 1999-08 Note: Register SYSCON cannot be changed after execution of the EINIT instruction. Bit SGTDIS controls the correct stack operation (push/pop of CSP or not) during traps and interrupts. The layout of the BUSCON registers and ADDRSEL registers is identical. Registers BUSCON4...BUSCON1, which control the selected address windows, are completely under software control, while register BUSCON0, which e.g. is also used for the very first code access after reset, is partly controlled by hardware, i.e. it is initialized via PORT0 during the reset sequence. This hardware control allows to define an appropriate external bus for systems, where no internal program memory is provided. CSCFG Chip Select Configuration Control 0: Latched CS mode. The CS signals are latched internally and driven to the (enabled) port pins synchronously. 1: Unlatched CS mode. The CS signals are directly derived from the address and driven to the (enabled) port pins. WRCFG Write Configuration Control (Set according to pin P0H.0 during reset) 0: Pins WR and BHE retain their normal function 1: Pin WR acts as WRL, pin BHE acts as WRH CLKEN System Clock Output Enable (CLKOUT) 0: CLKOUT disabled: pin may be used for general purpose IO or for signal FOUT 1: CLKOUT enabled: pin outputs the system clock signal BYTDIS Disable/Enable Control for Pin BHE (Set according to data bus width) 0: Pin BHE enabled 1: Pin BHE disabled, pin may be used for general purpose IO ROMEN Internal ROM Enable (Set according to pin EA during reset) 0: Internal program memory disabled, accesses to the ROM area use the external bus 1: Internal program memory enabled SGTDIS Segmentation Disable/Enable Control 0: Segmentation enabled (CSP is saved/restored during interrupt entry/exit) 1: Segmentation disabled (Only IP is saved/restored) ROMS1 Internal ROM Mapping 0: Internal ROM area mapped to segment 0 (00’0000 H...00’7FFFH) 1: Internal ROM area mapped to segment 1 (01’0000 H...01’7FFFH) STKSZ System Stack Size Selects the size of the system stack (in the internal RAM) from 32 to 512 words Bit Function |
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