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參數資料
| 型號： | M68HC16 |
| 廠商： | Motorola, Inc. |
| 英文描述： | 16-Bit Microcontroller(16位微控制器) |
| 中文描述： | 16位微控制器（16位微控制器） |
| 文件頁數： | 9/52頁 |
| 文件大小： | 358K |
| 代理商： | M68HC16 |
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AN1283/D
MOTOROLA
9
Figure 3 CPU16 Programming Model
3.1.1 Accumulators
The CPU16 has two 8-bit accumulators (A and B) and one 16-bit accumulator (E). In addition, accumulators
A and B can be concatenated into a second 16-bit double accumulator (D).
Accumulators A, B, and D are general-purpose registers used to hold operands and results during mathe-
matical and data manipulation operations.
Accumulator E can be used in the same way as accumulator D, and also extends CPU16 capabilities. It
allows more data to be held within the CPU16 during operations, simplifies 32-bit arithmetic and digital sig-
nal processing, and provides a practical 16-bit accumulator offset indexed addressing mode.
3.1.2 Index Registers
The CPU16 has three 16-bit index registers (IX, IY, and IZ). Each index register has an associated 4-bit
extension field (XK, YK, and ZK).
Concatenated registers and extension fields provide 20-bit indexed addressing and support data structure
functions anywhere in the CPU16 address space.
20
16 15
8 7
0 BIT POSITION
A
B
ACCUMULATORS A AND B
ACCUMULATOR D (A : B)
D
E
ACCUMULATOR E
XK
IX
INDEX REGISTER X
YK
IY
INDEX REGISTER Y
ZK
IZ
INDEX REGISTER Z
SK
SP
STACK POINTER
PK
PC
PROGRAM COUNTER
CCR
PK
CONDITION CODE REGISTER/
PC EXTENSION REGISTER
EK
XK
YK
ZK
ADDRESS EXTENSION REGISTER
SK
STAACK EXTENSION REGISTER
H
MAC MULTIPLIER REGISTER
IR
MAC MULTIPLICAND REGISTER
AM (MSB)
MAC ACCUMULATOR MSB [35:16]
MAC ACCUMULATOR LSB [15:0]
AM (LSB)
XMSK
YMSK
MAC XY MASK REGISTER
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