ST90E158LV View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ST90E158LV

8/16-BIT MCU FAMILY WITH UP TO 64K ROM/OTP/EPROM AND UP TO 2K RAM

STMicroelectronics 

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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