參數(shù)資料
型號: MC68HRC705KJ1CP
廠商: Freescale Semiconductor
文件頁數(shù): 38/108頁
文件大小: 0K
描述: IC MCU 1.2K 4MHZ OTP 16-DIP
標準包裝: 25
系列: HC05
核心處理器: HC05
芯體尺寸: 8-位
速度: 4MHz
外圍設備: POR,WDT
輸入/輸出數(shù): 10
程序存儲器容量: 1.2KB(1.2K x 8)
程序存儲器類型: OTP
RAM 容量: 64 x 8
電壓 - 電源 (Vcc/Vdd): 3 V ~ 5.5 V
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 16-DIP(0.300",7.62mm)
包裝: 管件
CPU Registers
MC68HC705KJ1 MC68HRC705KJ1 MC68HLC705KJ1 Data Sheet, Rev. 4.1
Freescale Semiconductor
35
4.5 CPU Registers
The M68HC05 CPU contains five registers that control and monitor MCU operation:
Accumulator
Index register
Stack pointer
Program counter
Condition code register
CPU registers are not memory mapped.
4.5.1 Accumulator
The accumulator is a general-purpose 8-bit register. The CPU uses the accumulator to hold operands and
results of ALU operations.
4.5.2 Index Register
In the indexed addressing modes, the CPU uses the byte in the index register to determine the conditional
address of the operand. The index register also can serve as a temporary storage location or a counter.
4.5.3 Stack Pointer
The stack pointer is a 16-bit register that contains the address of the next location on the stack. During a
reset or after the reset stack pointer instruction (RSP), the stack pointer is preset to $00FF. The address
in the stack pointer decrements after a byte is stacked and increments before a byte is unstacked.
Bit 7
654321
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 4-2. Accumulator (A)
Bit 7
654321
Bit 0
Read:
Write:
Reset:
Unaffected by reset
Figure 4-3. Index Register (X)
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Bit
0
Read:
0
00
000
001
1
Write:
Reset:
0
000
001
11
111
11
= Unimplemented
Figure 4-4. Stack Pointer (SP)
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