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| 型号： | MC38HC705J2 |
| 厂商： | Motorola, Inc. |
| 元件分类： | DC/DC变换器 |
| 英文描述： | RTS Series - Econoline Unregulated DC-DC Converters; Input Voltage (Vdc): 05V; Output Voltage (Vdc): 3.3V; Power: 2W; Assembly; High Power Density; Optional Continuous Short Circuit Protected; Efficiency to 85% |
| 中文描述： | M68HC05系列系列8位微控制器单元 |
| 文件页数： | 53/78页 |
| 文件大小： | 427K |
| 代理商： | MC38HC705J2 |
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MC68HC705J2
MEMORY
MOTOROLA
6-1
SECTION 6
MEMORY
This section describes the organization of the on-chip memory.
6.1 Memory Map
The CPU can address 4 Kbytes of memory space. The program counter
normally advances one address at a time through the memory, reading the
program instructions and data. The EPROM portion of memory holds the
program instructions, fixed data, user-defined vectors, and service routines.
The RAM portion of memory holds variable data. I/O registers are
memory-mapped so that the CPU can access their locations in the same way
that it accesses all other memory locations.
Figure 6-1 is a memory map of the MCU. Figure 6-2 is a more detailed memory
map of the 32-byte I/O register section.
6.1.1 Input/Output Section
The first 32 addresses of the memory space, $0000–$001F, are defined as the
I/O section. These are the addresses of the I/O control registers, I/O status
registers, and I/O data registers.
6.1.2 RAM
The MCU has 112 bytes of fully static read/write memory for storage of variable
and temporary data during program execution. RAM addresses $00C0–$00FF
serve as the stack. The CPU uses the stack to save CPU register contents
before processing an interrupt or subroutine call. The stack pointer decrements
during pushes and increments during pulls.
NOTE
Be careful if using the stack addresses ($00C0–$00FF) for data
storage or as a temporary work area. The CPU may overwrite
data in the stack during a subroutine or interrupt.
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