參數(shù)資料
型號(hào): AN1218
廠商: 飛思卡爾半導(dǎo)體(中國(guó))有限公司
英文描述: HC05 to HC08 Optimization
中文描述: 以HC08的優(yōu)化HC05
文件頁(yè)數(shù): 4/56頁(yè)
文件大小: 417K
代理商: AN1218
Application Note
AN1218 Rev. 2
4
Figure 1. CPU05 and CPU08 Comparison
Program Counter
Expanded
The CPU08 program counter (PC) has been expanded to 16 bits which
allows the CPU08 to address 64 KBytes of memory. Not all HC05
devices have a 16-bit program counter.
New Addressing
Modes,
Comparison
CPU08 has 16 addressing modes, 8 more than the HC05.
Table 1
lists
these addressing modes and the CPUs that use them. A brief
discussion of these modes is given below.
A
7
0
X
7
0
H
I
N
Z
C
CCR
1
1
SP
7
0
PC
12
0
ACCUMULATOR
INDEX REGISTER
PROGRAMCOUNTER
STACK POINTER
CONDITION CODE REGISTER
0
0
0
0
0
12
ACCUMULATOR (A)
INDEX REGISTER (H:X)
STACK POINTER (SP)
PROGRAMCOUNTER (PC)
CONDITION CODE REGISTER (CCR)
V 1 1 H I N Z C
H
X
0
0
0
0
7
15
15
15
7
0
(a) CPU05
(b) CPU08
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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