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数据搜索系统，热门电子元器件搜索 |
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ST7LITEUS2 数据表(PDF) 26 Page - STMicroelectronics |
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ST7LITEUS2 数据表(HTML) 26 Page - STMicroelectronics |
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26 / 136 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Central processing unit ST7LITEUS2, ST7LITEUS5 26/136 5.3.5 Stack Pointer (SP) Reset value: 00 FFh The Stack Pointer is a 16-bit register which is always pointing to the next free location in the stack. It is then decremented after data has been pushed onto the stack and incremented before data is popped from the stack (see Figure 8). Since the stack is 64 bytes deep, the 10 most significant bits are forced by hardware. Following an MCU Reset, or after a Reset Stack Pointer instruction (RSP), the Stack Pointer contains its reset value (the SP5 to SP0 bits are set) which is the stack higher address. The least significant byte of the Stack Pointer (called S) can be directly accessed by a LD instruction. Note: When the lower limit is exceeded, the Stack Pointer wraps around to the stack upper limit, without indicating the stack overflow. The previously stored information is then overwritten and therefore lost. The stack also wraps in case of an underflow. The stack is used to save the return address during a subroutine call and the CPU context during an interrupt. The user may also directly manipulate the stack by means of the PUSH and POP instructions. In the case of an interrupt, the PCL is stored at the first location pointed to by the SP. Then the other registers are stored in the next locations as shown in Figure 8. ● When an interrupt is received, the SP is decremented and the context is pushed on the stack. ● On return from interrupt, the SP is incremented and the context is popped from the stack. A subroutine call is located at two locations and an interrupt five locations in the stack area. 15 8 00000000 Read/write 7 0 1 1 SP5 SP4 SP3 SP2 SP1 SP0 Read/write Obsolete Product(s) - Obsolete Product(s) |
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