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D17133CS Datasheet

  • D17133CS

  • 4-BIT SINGLE-CHIP MICROCONTROLLER

  • 1138.87KB

  • 289頁

  • NEC   NEC

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CHAPTER 4
PROGRAM MEMORY (ROM)
4.2.2 Table Reference
Table reference is used to reference constant data in program memory.
The table reference instruction (MOVT DBF, @AF) is used to store the contents of the program memory address
specified by the address register in the data buffer.
Since each location in program memory contains 16 bits of information, the MOVT instruction causes 16 bits of
data to be stored in the data buffer. The address register can be used to table reference any location in program
memory.
Caution Note that one level of the stack is temporarily used when performing table reference.
Also refer to 7.2 ADDRESS REGISTER (AR) and CHAPTER 10 DATA BUFFER (DBF).
Remark
As an exception, execution of table reference instructions requires two instruction cycle.
Figure 4-3. Table Reference (MOVT DBF, @AR)
Data buffer
DBF3
DBF2
DBF1
DBF0
Program memory
b
15
b
14
b
13
b
12
b
11
b
10
b
9
b
8
b
7
b
6
b
5
b
4
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
16-bit data read
Address register
AR3
AR2
AR1
AR0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
b
3
b
2
b
1
b
0
0
0
0
0
0
0
Table addressing
Constant data
27

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