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UM0434 Datasheet(PDF) 62 Page - STMicroelectronics |
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UM0434 Datasheet(HTML) 62 Page - STMicroelectronics |
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62 / 390 page  UM0434 Register model 63/391 4.10 Software use SPRs (SPRG0–SPRG7 and USPRG0) Software use SPRs (SPRG0 - SPRG7 and USPRG0, shown in Table 39) have no defined functionality: ● SPRG0 - SPRG2 - Accessible only in supervisor mode. ● SPRG3 - Written only in supervisor mode. It is readable in supervisor mode, but whether it can be read in user mode depends on the implementation. It is not readable in user mode on th e200z3. ● SPRG4 - SPRG7 - Written only in supervisor mode. They are readable in supervisor or user mode. ● USPRG0 - Accessible in supervisor or user mode. Software use SPRs are read into a GPR using mfspr and are written using mtspr. 4.11 Timer registers The time base (TB), decrementer (DEC), fixed-interval timer (FIT), and watchdog timer provide timing functions for the system. The relationship of these timers to each other is shown in Figure l. Table 39. Software use SPRs (SPRG0–SPRG7 and USPRG0) 32 63 Field Software determined information Reset Undefined on m_por assertion, unchanged on p_reset_b assertion SPR R/W SPRG0 272 Read/Write Supervisor SPRG1 273 Read/Write Supervisor SPRG2 274 Read/Write Supervisor SPRG3 259 Read only User(1)/Supervisor 1. User-mode access to SPRG3 is defined by Book E as implementation-dependent. It is not supported in the e200z3. 275 Read/Write Supervisor SPRG4 260 Read only User/Supervisor 276 Read/Write Supervisor SPRG5 261 Read only User/Supervisor 277 Read/Write Supervisor SPRG6 262 Read only User/Supervisor 278 Read/Write Supervisor SPRG7 263 Read only User/Supervisor 279 Read/Write Supervisor USPRG0 256 Read/Write User/Supervisor |
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