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C161 Datasheet(PDF) 42 Page - Infineon Technologies AG |
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C161 Datasheet(HTML) 42 Page - Infineon Technologies AG |
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42 / 400 page  &3, 0HPRU\ 2UJDQL]DWLRQ User’s Manual 3-6 1999-08 General Purpose Registers The General Purpose Registers (GPRs) use a block of 16 consecutive words within the internal RAM. The Context Pointer (CP) register determines the base address of the currently active register bank. This register bank may consist of up to 16 Word-GPRs (R0, R1, ..., R15) and/or of up to 16 Byte-GPRs (RL0, RH0, ..., RL7, RH7). The sixteen Byte-GPRs are mapped onto the first eight Word-GPRs (see table below). In contrast to the system stack, a register bank grows from lower towards higher address locations and occupies a maximum space of 32 Byte. The GPRs are accessed via short 2-, 4-, or 8-bit addressing modes using the Context Pointer (CP) register as base address (independent of the current DPP register contents). Additionally, each bit in the currently active register bank can be accessed individually. The C161PI supports fast register bank (context) switching. Multiple register banks can physically exist within the internal RAM at the same time. Only the register bank selected by the Context Pointer register (CP) is active at a given time, however. Selecting a new active register bank is simply done by updating the CP register. A particular Switch Context (SCXT) instruction performs register bank switching and an automatic saving of the previous context. The number of implemented register banks (arbitrary sizes) is only limited by the size of the available internal RAM. Details on using, switching and overlapping register banks are described in chapter “System Programming”. Table 3-2 Mapping of General Purpose Registers to RAM Addresses Internal RAM Address Byte Registers Word Register <CP> + 1E H --- R15 <CP> + 1C H --- R14 <CP> + 1A H --- R13 <CP> + 18 H --- R12 <CP> + 16 H --- R11 <CP> + 14 H --- R10 <CP> + 12 H --- R9 <CP> + 10 H --- R8 <CP> + 0E H RH7 RL7 R7 <CP> + 0C H RH6 RL6 R6 <CP> + 0A H RH5 RL5 R5 <CP> + 08 H RH4 RL4 R4 <CP> + 06 H RH3 RL3 R3 <CP> + 04 H RH2 RL2 R2 <CP> + 02 H RH1 RL1 R1 <CP> + 00 H RH0 RL0 R0 |
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