參數(shù)資料
型號： MCHC11F1CFNE5
廠商： Freescale Semiconductor
文件頁數(shù)： 79/158頁
文件大?。?/td> 0K
描述： MCU 8BIT 1KRAM 512EE 68-PLCC
標(biāo)準(zhǔn)包裝： 18
系列： HC11
核心處理器： HC11
芯體尺寸： 8-位
速度： 5MHz
連通性： SCI，SPI
外圍設(shè)備： POR，WDT
輸入/輸出數(shù)： 30
程序存儲器類型： ROMless
EEPROM 大?。?/td> 512 x 8
RAM 容量： 1K x 8
電壓 - 電源 (Vcc/Vdd)： 4.75 V ~ 5.25 V
數(shù)據(jù)轉(zhuǎn)換器： A/D 8x8b
振蕩器型： 內(nèi)部
工作溫度： -40°C ~ 85°C
封裝/外殼： 68-LCC（J 形引線）
包裝： 管件
CENTRAL PROCESSING UNIT
TECHNICAL DATA
3-3
The add, subtract, and compare instructions associated with both A and B (ABA, SBA,
and CBA) only operate in one direction, making it important to plan ahead to ensure
that the correct operand is in the correct accumulator.
3.1.2 Index Register X (IX)
The IX register provides a 16-bit indexing value that can be added to the 8-bit offset
provided in an instruction to create an effective address. The IX register can also be
used as a counter or as a temporary storage register.
3.1.3 Index Register Y (IY)
The 16-bit IY register performs an indexed mode function similar to that of the IX reg-
ister. However, most instructions using the IY register require an extra byte of machine
code and an extra cycle of execution time because of the way the opcode map is im-
plemented. Refer to 3.3 Opcodes and Operands for further information.
3.1.4 Stack Pointer (SP)
The M68HC11 CPU has an automatic program stack. This stack can be located any-
where in the address space and can be any size up to the amount of memory available
in the system. Normally the SP is initialized by one of the first instructions in an appli-
cation program. The stack is configured as a data structure that grows downward from
high memory to low memory. Each time a new byte is pushed onto the stack, the SP
is decremented. Each time a byte is pulled from the stack, the SP is incremented. At
any given time, the SP holds the 16-bit address of the next free location in the stack.
Figure 3-2 is a summary of SP operations.
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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