ST92141 STMicroelectronics, ST92141 Datasheet - Page 30

• Manufacturer Part Number: ST92141
• Description: 8/16-bit Mcu For 3-phase Ac Motor Control
• Manufacturer: STMicroelectronics

ST92141 - 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 9. Internal Stack Mode
30/179
USP15 USP14 USP13 USP12 USP11 USP10 USP9
USP7 USP6 USP5 USP4 USP3 USP2 USP1 USP0
7
7
1
4
3
2
1
0
F
E
D
REGISTER
STACK
FILE
STACK POINTER (LOW)
points to:
USP8
0
0
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 10. External Stack Mode
SSP15 SSP14 SSP13 SSP12 SSP11 SSP10 SSP9
SSP7 SSP6
7
7
4
3
2
1
0
F
E
D
REGISTER
FILE
SSP5
SSP4 SSP3
STACK POINTER (HIGH)
STACK POINTER (LOW)
point to:
&
SSP2 SSP1
MEMORY
STACK
SSP8
SSP0
0
0