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參數(shù)資料
| 型號： | 68HC05BD7 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 8-Bit Microcontroller Units (MCU).(8位微控制器) |
| 中文描述： | 8位微控制器單元（MCU）。（8位微控制器） |
| 文件頁數(shù)： | 27/85頁 |
| 文件大?。?/td> | 302K |
| 代理商： | 68HC05BD7 |
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SECTION 3: CPU CORE
MOTOROLA
Page 17
MC68HC05BD7 Rev. 2.0
GENERAL RELEASE SPECIFICATION
PRELMNARY
SECTION 3
CPU CORE
The MC68HC05BD7 has a 16K memory map. Therefore it uses only the lower 14 bits of
the address bus. In the following discussion the upper 2 bits of the address bus can be
ignored. The stack has only 64 bytes. Therefore, the stack pointer has been reduced to only
6 bits and will only decrement down to $00C0 and then wrap-around to $00FF. All other
instructions and registers behave as described in this chapter.
3.1
The MCU contains five registers which are hard-wired within the CPU and are not part of
the memory map. These five registers are shown in
Figure 3-1
and are described in the
following paragraphs.
Figure 3-1: MC68HC05 Programming Model
3.1.1
Accumulator (A)
The accumulator is a general purpose 8-bit register as shown in
Figure 3-1
. The CPU uses
the accumulator to hold operands and results of arithmetic calculations or non-arithmetic
operations. The accumulator is not affected by a reset of the device.
CONDITION CODE REGISTER
I
ACCUMULATOR
6
0
A
INDEX REGISTER
7
1
X
4
5
2
3
STACK POINTER
SP
14
8
15
9
12
13
10
11
PC
CC
1
1
1
1
1
0
0
0
0
0
0
0
0
PROGRAM COUNTER
H
Z
C
HALF-CARRY BIT (FROM BIT 3)
INTERRUPT MASK
NEGATIVE BIT
ZERO BIT
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