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PM0044 bảng dữ liệu(PDF) 14 Page - STMicroelectronics

tên linh kiện PM0044
Giải thích chi tiết về linh kiện  STM8 CPU programming manual
PDF  162 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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PM0044 bảng dữ liệu(HTML) 14 Page - STMicroelectronics

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STM8 core description
PM0044
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Doc ID 13590 Rev 3
Stack Pointer (SP)
The stack pointer is a 16-bit register. It contains the address of the next free location of the
stack. Depending on the product, the most significant bits can be forced to a preset value.
The stack is used to save the CPU context on subroutines calls or interrupts. The user can
also directly use it through the POP and PUSH instructions.
After an MCU reset the Stack Pointer is set to its upper limit value. It is then decremented
after data has been pushed onto the stack and incremented after data is popped from the
stack. When the lower limit is exceeded, the stack pointer wraps around to the stack upper
limit. The previously stored information is then overwritten, and therefore lost.
A subroutine call occupies two or three locations.
When an interrupt occurs, the CPU registers (CC, X, Y, A, PC) are pushed onto the stack.
This operation takes 9 CPU cycles and uses 9 bytes in RAM.
Note:
The WFI/HALT instructions save the context in advance. If an interrupt occurs while the CPU
is in one of these modes, the latency is reduced.
Figure 2.
Context save/restore for interrupts



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