參數(shù)資料
型號: MC68HC05C9EP
廠商: MOTOROLA INC
元件分類: 微控制器/微處理器
英文描述: 8-BIT, MROM, 2.1 MHz, MICROCONTROLLER, PDIP40
封裝: PLASTIC, DIP-40
文件頁數(shù): 67/144頁
文件大?。?/td> 1628K
代理商: MC68HC05C9EP
Memory
RAM
MC68HC05C9E
Advance Information
MOTOROLA
Memory
29
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2.3 RAM
The main user RAM consists of 176 bytes at $0050–$00FF. This RAM
area is always present in the memory map and includes a 64-byte stack
area. The stack pointer can access 64 bytes of RAM in the range $00FF
down to $00C0.
NOTE:
Using the stack area for data storage or temporary work locations
requires care to prevent it from being overwritten due to stacking from an
interrupt or subroutine call.
Two additional RAM areas are available at $0020–$004F (48 bytes) and
$0100–$017F (128 bytes) (see Figure 2-1 and Figure 2-2.) These may
be accessed at any time by setting the RAM0 and RAM1 bits,
respectively, in the option register.
Refer to 1.5 Software-Programmable Options for additional
information.
2.4 ROM
The user ROM consists of 48 bytes of page zero ROM from $0020 to
$004F, 15,872 bytes of ROM from $0100 to $3EFF, and 16 bytes of user
vectors from $3FF0 to $3FFF.
2.5 ROM Security
A security feature has been incorporated into the MC68HC05C9E to
help prevent external access to the contents of the ROM in any mode of
operation.
2.6 I/O Registers
Except for the option register, all I/O, control and status registers are
located within one 32-byte block in page zero of the address space
($0000–$001F). A summary of these registers is shown in Figure 2-2.
More detail about the contents of these registers is given in Figure 2-3.
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