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ST90E158LV Ver la hoja de datos (PDF) - STMicroelectronics

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ST90E158LV 8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM ST-Microelectronics
STMicroelectronics ST-Microelectronics
ST90E158LV Datasheet PDF : 190 Pages
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ST90158 - DEVICE ARCHITECTURE
SYSTEM REGISTERS (Cont’d)
USER STACK POINTER HIGH REGISTER
(USPHR)
R236 - Read/Write
Register Group: E (System)
Reset value: undefined
7
0
USP1
5
USP1
4
USP1
3
USP1
2
USP1
1
USP1
0
USP9
USP8
USER STACK POINTER LOW REGISTER
(USPLR)
R237 - Read/Write
Register Group: E (System)
Reset value: undefined
7
0
USP7 USP6 USP5 USP4 USP3 USP2 USP1 USP0
SYSTEM STACK POINTER HIGH REGISTER
(SSPHR)
R238 - Read/Write
Register Group: E (System)
Reset value: undefined
7
0
SSP1
5
SSP1
4
SSP1
3
SSP1
2
SSP1
1
SSP1
0
SSP9
SSP8
SYSTEM STACK POINTER LOW REGISTER
(SSPLR)
R239 - Read/Write
Register Group: E (System)
Reset value: undefined
7
0
SSP7 SSP6 SSP5 SSP4 SSP3 SSP2 SSP1 SSP0
Figure 11. Internal Stack Mode
Figure 12. External Stack Mode
REGIST ER
FILE
F
STACK POINTER (LOW)
points to:
E
STACK
D
REG ISTER
FILE
F
E
STACK POINTER (LOW)
&
STACK POINTER (HIGH)
point to:
MEMORY
D
STACK
4
4
3
3
2
2
1
1
0
0
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