参数资料
型号: MC68HC05J1AVDW
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封装: SOIC-20
文件页数: 50/128页
文件大小: 1279K
代理商: MC68HC05J1AVDW
Technical Data
MC68HC05J1A — Rev. 3.0
28
Memory
MOTOROLA
Memory
2.4 Input/Output (I/O) Section
The first 32 addresses of the memory space, $0001–$001F, are the I/O
section. These are the addresses of the I/O control registers, status
registers, and data registers. See Figure 2-2.
One I/O register shown in Figure 2-2 is located outside the 32-byte I/O
section: the computer operating properly (COP) register is mapped at
$07F0.
2.5 Random-Access Memory (RAM)
The 64 addresses from $00C0 to $00FF serve as both the user RAM and
the stack RAM. The CPU uses five stack RAM bytes to save all CPU
register contents before processing an interrupt. During a subroutine
call, the CPU uses two bytes to store the return address. The stack
pointer decrements during pushes and increments during pulls.
NOTE:
Be careful when using nested subroutines or multiple interrupt levels.
The CPU may overwrite data in the RAM during a subroutine or during
the interrupt stacking operation.
2.6 Read-Only Memory (ROM)
The ROM is located in two areas of the memory map:
1. Addresses $0300–$07CF contain 1232 bytes of user ROM.
2. Addresses $07F8–$07FF contain 16 bytes of ROM reserved for
user vectors.
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