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ST92F124CR1QB Datasheet(PDF) 41 Page - STMicroelectronics |
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ST92F124CR1QB Datasheet(HTML) 41 Page - STMicroelectronics |
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41 / 429 page  41/429 ST92F124/F150/F250 - DEVICE ARCHITECTURE SYSTEM REGISTERS (Cont’d) USER STACK POINTER HIGH REGISTER (USPHR) R236 - Read/Write Register Group: E (System) Reset value: undefined USER STACK POINTER LOW REGISTER (USPLR) R237 - Read/Write Register Group: E (System) Reset value: undefined Figure 24. Internal Stack Mode SYSTEM STACK POINTER HIGH REGISTER (SSPHR) R238 - Read/Write Register Group: E (System) Reset value: undefined SYSTEM STACK POINTER LOW REGISTER (SSPLR) R239 - Read/Write Register Group: E (System) Reset value: undefined Figure 25. External Stack Mode 70 USP15 USP14 USP13 USP12 USP11 USP10 USP9 USP8 70 USP7 USP6 USP5 USP4 USP3 USP2 USP1 USP0 F E D 4 3 2 1 0 REGISTER FILE STACK POINTER (LOW) points to: STACK 70 SSP15 SSP14 SSP13 SSP12 SSP11 SSP10 SSP9 SSP8 70 SSP7 SSP6 SSP5 SSP4 SSP3 SSP2 SSP1 SSP0 F E D 4 3 2 1 0 REGISTER FILE STACK POINTER (LOW) point to: STACK MEMORY STACK POINTER (HIGH) & 9 |
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