参数资料
型号: MC68HC705J1ACDWR2
厂商: MOTOROLA INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PDSO20
封装: SOIC-20
文件页数: 92/162页
文件大小: 1517K
代理商: MC68HC705J1ACDWR2
Memory
RAM
MC68HC705J1A — Rev. 3.0
Technical Data
MOTOROLA
Memory
35
2.5 RAM
The 64 addresses from $00C0 to $00FF serve as both the user RAM
and the stack RAM. Before processing an interrupt, the central
processor unit (CPU) uses five bytes of the stack to save the contents of
the CPU registers. During a subroutine call, the CPU uses two bytes of
the stack to store the return address. The stack pointer decrements
when the CPU stores a byte on the stack and increments when the CPU
retrieves a byte from the stack.
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.
$0019
Unimplemented
$001E
Unimplemented
$001F
Reserved
RRRRRRRR
$07F0
COP Register
(COPR)
Read:
Write:
COPC
Reset:
0
$07F1
Mask Option Register
(MOR)
Read:
SOSCD
EPMSEC OSCRES
SWAIT
SWPDI
PIRQ
LEVEL
COPEN
Write:
Reset:
00000000
Addr.
Register Name
Bit 7
654321
Bit 0
= Unimplemented
R = Reserved
Figure 2-2. I/O Register Summary (Sheet 3 of 3)
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