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SAFC161PI Datasheet(PDF) 64 Page - Infineon Technologies AG |
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SAFC161PI Datasheet(HTML) 64 Page - Infineon Technologies AG |
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64 / 400 page  &3, 7KH &HQWUDO 3URFHVVLQJ 8QLW &38 User’s Manual 4-16 1999-08 System Clock Output Enable (CLKEN) The system clock output function is enabled by setting bit CLKEN in register SYSCON to ’1’. If enabled, port pin P3.15 takes on its alternate function as CLKOUT output pin. The clock output is a 50 % duty cycle clock (except for direct drive operation where CLKOUT reflects the clock input signal, and for slowdown operation where CLKOUT mirrors the CPU clock signal) whose frequency equals the CPU operating frequency ( f OUT = fCPU). Note: The output driver of port pin P3.15 is switched on automatically, when the CLKOUT function is enabled. The port direction bit is disregarded. After reset, the clock output function is disabled (CLKEN = ‘0’). In emulation mode the CLKOUT function is enabled automatically. Segmentation Disable/Enable Control (SGTDIS) Bit SGTDIS allows to select either the segmented or non-segmented memory mode. In non-segmented memory mode (SGTDIS=’1’) it is assumed that the code address space is restricted to 64 KBytes (segment 0) and thus 16 bits are sufficient to represent all code addresses. For implicit stack operations (CALL or RET) the CSP register is totally ignored and only the IP is saved to and restored from the stack. In segmented memory mode (SGTDIS=’0’) it is assumed that the whole address space is available for instructions. For implicit stack operations (CALL or RET) the CSP register and the IP are saved to and restored from the stack. After reset the segmented memory mode is selected. Note: Bit SGTDIS controls if the CSP register is pushed onto the system stack in addition to the IP register before an interrupt service routine is entered, and it is repopped when the interrupt service routine is left again. System Stack Size (STKSZ) This bitfield defines the size of the physical system stack, which is located in the internal RAM of the C161PI. An area of 32...256 words or all of the internal RAM may be dedicated to the system stack. A so-called “circular stack” mechanism allows to use a bigger virtual stack than this dedicated RAM area. These techniques as well as the encoding of bitfield STKSZ are described in more detail in chapter “System Programming”. |
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