C8051F91X-C8051F90X 데이터 시트보기 (PDF) - Silicon Laboratories

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C8051F91X-C8051F90X

Single/Dual Battery, 0.9–3.6 V, 16–8 kB, SmaRTClock, 12/10-Bit ADC MCU

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C8051F91x-C8051F90x

9.2.1.3. Stack

A programmer's stack can be located anywhere in the 256-byte data memory. The stack area is

designated using the Stack Pointer (SP) SFR. The SP will point to the last location used. The next value

pushed on the stack is placed at SP+1 and then SP is incremented. A reset initializes the stack pointer to

location 0x07. Therefore, the first value pushed on the stack is placed at location 0x08, which is also the

first register (R0) of register bank 1. Thus, if more than one register bank is to be used, the SP should be

initialized to a location in the data memory not being used for data storage. The stack depth can extend up

to 256 bytes.

9.2.2. External RAM

There are 512 bytes of on-chip RAM mapped into the external data memory space. All of these address

locations may be accessed using the external move instruction (MOVX) and the data pointer (DPTR), or

using MOVX indirect addressing mode (such as @R1) in combination with the EMI0CN register.

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Rev. 1.0

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