参数资料
型号: MC68HC08QY4CDWE
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16
封装: 1.27 MM PITCH, LEAD FREE, PLASTIC, MS-013AA, SOIC-16
文件页数: 93/178页
文件大小: 2311K
代理商: MC68HC08QY4CDWE
MC68HC08QY/QT Family Data Sheet, Rev. 1
Freescale Semiconductor
21
Chapter 2
Memory
2.1 Introduction
The central processor unit (CPU08) can address 64 Kbytes of memory space. The memory map is shown
2.2 Unimplemented Memory Locations
Executing code from an unimplemented location will cause an illegal address reset. In Figure 2-1,
unimplemented locations are shaded.
2.3 Reserved Memory Locations
Accessing a reserved location can have unpredictable effects on MCU operation. In Figure 2-1, reserved
locations are marked with the word reserved or with the letter R.
2.4 Direct Page Registers
Figure 2-2 shows the memory mapped registers of the MC68HC08QY/QT Family. Registers with
addresses between $0000 and $00FF are considered direct page registers and all instructions including
those with direct page addressing modes can access them. Registers between $0100 and $FFFF require
non-direct page addressing modes. See Chapter 7 Central Processor Unit (CPU) for more information on
addressing modes.
2.5 Unused ROM Locations
Any location in the ROM memory map that is not specified in the user supplied S-record will be factory
programmed to an $83, which is an SWI opcode. The user should provide an interrupt service routine
address at the SWI interrupt vector ($FFFC/D) that points to an appropriate error routine.
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