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ST90E158 Datasheet(PDF) 28 Page - STMicroelectronics |
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ST90E158 Datasheet(HTML) 28 Page - STMicroelectronics |
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28 / 190 page  28/190 ST90158 - 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 11. 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 12. External Stack Mode 70 USP1 5 USP1 4 USP1 3 USP1 2 USP1 1 USP1 0 USP9 USP8 70 USP7 USP6 USP5 USP4 USP3 USP2 USP1 USP0 F E D 4 3 2 1 0 REGIST ER FILE STA CK POINTER (LOW) points to: STACK 70 SSP1 5 SSP1 4 SSP1 3 SSP1 2 SSP1 1 SSP1 0 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 STA CK POINTER (HIGH) & 9 |
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