- 您现在的位置：买卖IC网 > PDF目录379948 > COP8SGA040N9 (National Semiconductor Corporation) 8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART PDF资料下载
参数资料
| 型号： | COP8SGA040N9 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | 8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART |
| 中文描述： | 8位的CMOS基于ROM和OTP微控制器具有8K到32K的内存，2个比较器和USART |
| 文件页数： | 48/62页 |
| 文件大小： | 913K |
| 代理商： | COP8SGA040N9 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页当前第48页第49页第50页第51页第52页第53页第54页第55页第56页第57页第58页第59页第60页第61页第62页
14.0 Instruction Set
(Continued)
Example: Load Accumulator Immediate
LD A,
#
05
Reg/Data
Memory
Accumulator
Contents
Before
XX Hex
Contents
After
05 Hex
Immediate Short.
This is a special case of an immediate
instruction. In the “Load B immediate” instruction, the 4-bit
immediate value in the instruction is loaded into the lower
nibble of the B register. The upper nibble of the B register is
reset to 0000 binary.
Example: Load B Register Immediate Short
LD B,
#
7
Reg/Data
Memory
B Pointer
Contents
Before
12 Hex
Contents
After
07 Hex
Indirect from Program Memory.
This is a special case of
an indirect instruction that allows access to data tables
stored in program memory. In the “Load Accumulator Indi-
rect” (LAID) instruction, the upper and lower bytes of the
Program Counter (PCU and PCL) are used temporarily as a
pointer to program memory. For purposes of accessing pro-
gram memory, the contents of the Accumulator and PCL are
exchanged. The data pointed to by the Program Counter is
loaded into theAccumulator, and simultaneously, the original
contents of PCL are restored so that the program can re-
sume normal execution.
Example: Load Accumulator Indirect
LAID
Reg/Data
Memory
PCU
PCL
Accumulator
Memory Location
041F Hex
Contents
Before
04 Hex
35 Hex
1F Hex
25 Hex
Contents
After
04 Hex
36 Hex
25 Hex
25 Hex
14.3.2 Tranfer-of-Control Addressing Modes
Program instructions are usually executed in sequential or-
der. However, Jump instructions can be used to change the
normal execution sequence. Several transfer-of-control ad-
dressing modes are available to specify jump addresses.
A change in program flow requires a non-incremental
change in the Program Counter contents. The Program
Counter consists of two bytes, designated the upper byte
(PCU) and lower byte (PCL). The most significant bit of PCU
is not used, leaving 15 bits to address the program memory.
Different addressing modes are used to specify the new
address for the Program Counter. The choice of addressing
mode depends primarily on the distance of the jump. Farther
jumps sometimes require more instruction bytes in order to
completely specify the new Program Counter contents.
The available transfer-of-control addressing modes are:
Jump Relative
Jump Absolute
Jump Absolute Long
The transfer-of-control addressing modes are described be-
low. Each description includes an example of a Jump in-
struction using a particular addressing mode, and the effect
on the Program Counter bytes of executing that instruction.
Jump Relative.
In this 1-byte instruction, six bits of the
instruction opcode specify the distance of the jump from the
current program memory location. The distance of the jump
can range from 31 to +32.AJP+1 instruction is not allowed.
The programmer should use a NOP instead.
Example: Jump Relative
JP 0A
Jump Indirect
Reg
Contents
Before
02 Hex
05 Hex
Contents
After
02 Hex
0F Hex
PCU
PCL
Jump Absolute.
In this 2-byte instruction, 12 bits of the
instruction opcode specify the new contents of the Program
Counter. The upper three bits of the Program Counter re-
main unchanged, restricting the new Program Counter ad-
dress to the same 4 kbyte address space as the current
instruction.
(This restriction is relevant only in devices using more than
one 4 kbyte program memory space.)
Example: Jump Absolute
JMP 0125
Reg
Contents
Before
0C Hex
77 Hex
Contents
After
01 Hex
25 Hex
PCU
PCL
Jump Absolute Long.
In this 3-byte instruction, 15 bits of
the instruction opcode specify the new contents of the Pro-
gram Counter.
Example: Jump Absolute Long
JMP 03625
Reg/
Memory
PCU
PCL
Contents
Before
42 Hex
36 Hex
Contents
After
36 Hex
25 Hex
Jump Indirect.
In this 1-byte instruction, the lower byte of
the jump address is obtained from a table stored in program
memory, with the Accumulator serving as the low order byte
of a pointer into program memory. For purposes of access-
ing program memory, the contents of the Accumulator are
written to PCL (temporarily). The data pointed to by the
Program Counter (PCH/PCL) is loaded into PCL, while PCH
remains unchanged.
Example: Jump Indirect
JID
Reg/
Memory
PCU
PCL
Accumulator
Memory
Contents
Before
01 Hex
C4 Hex
26 Hex
Contents
After
01 Hex
32 Hex
26 Hex
C
www.national.com
48
相关PDF资料 |
PDF描述 |
|---|---|
| COP8SGA040Q3 | LMH0046 HD/SD SDI Reclocker with Dual Differential Outputs; Package: TSSOP EXP PAD; No of Pins: 20 |
| COP8SGA040Q6 | 8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART |
| COP8SGA040Q7 | 8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART |
| COP8SGA040Q8 | 8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART |
| COP8SGA040Q9 | 8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART |
相关代理商/技术参数 |
参数描述 |
|---|---|
| COP8SGA040Q3 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART |
| COP8SGA040Q6 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART |
| COP8SGA040Q7 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART |
| COP8SGA040Q8 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART |
| COP8SGA040Q9 | 制造商:NSC 制造商全称:National Semiconductor 功能描述:8-Bit CMOS ROM Based and OTP Microcontrollers with 8k to 32k Memory, Two Comparators and USART |
发布紧急采购，3分钟左右您将得到回复。