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參數(shù)資料
| 型號(hào)： | MC68HC05K3P |
| 廠商： | MOTOROLA INC |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, MROM, 2 MHz, MICROCONTROLLER, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數(shù)： | 31/69頁 |
| 文件大?。?/td> | 1383K |
| 代理商： | MC68HC05K3P |
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Central Processor Unit (CPU) Core
Registers
MC68HC05K3 — Rev. 5
Technical Data
MOTOROLA
Central Processor Unit (CPU) Core
37
3.3.1 Stack Pointer (SP)
The stack pointer shown in Figure 3-1 is a 16-bit register internally. In
devices with memory maps less than 64 Kbytes, the unimplemented
upper address lines are ignored. The stack pointer contains the address
of the next free location on the stack. When accessing memory, the 11
most significant bits are permanently set to 00000000111. The five least
significant register bits are appended to these 11 fixed bits to produce an
address within the range of $00FF to $00E0. Subroutines and interrupts
may use up to 32 ($20) locations. If 32 locations are exceeded, the stack
pointer wraps around to $00FF and writes over the previously stored
information.
3.3.2 Program Counter (PC)
The program counter shown in Figure 3-1 is a 16-bit register internally.
The program counter contains the address of the next instruction or
operand to be fetched. The six most significant bits of the program
counter are ignored internally and appear as 000000 when stacked onto
the RAM.
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