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UPD17P136ACT 데이터시트(PDF) 46 Page - NEC

부품명 UPD17P136ACT
상세설명  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  292 Pages
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제조업체  NEC [NEC]
홈페이지  http://www.nec.com/
Logo NEC - NEC

UPD17P136ACT 데이터시트(HTML) 46 Page - NEC

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CHAPTER 4 PROGRAM MEMORY (ROM)
27
4.2.2
Table Reference
Table reference is used to reference constant data in program memory.
The table reference instruction (MOVT DBF, @AR) 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 address stack is temporarily used when performing table reference.
Be sure not to exceed the stack level that can be used. Also see 7.2 ADDRESS REGISTER (AR)
and CHAPTER 10 DATA BUFFER (DBF).
Remark Two instruction cycles are required to execute the table reference instruction, but this is an exception.
Figure 4-3. Table Reference (MOVT DBF, @AR)
Note This bit is fixed to 0 in the case of the
µPD17134A and µPD17135A.
b15
b4
b5
b6
b7
b8
b9
b14 b13 b12 b11 b10
Constant data
Program memory
AR3
AR2
AR1
AR0
Address register
00000
16-bit data read
Table address specification
b0
b1
b2
b3
DBF3
Data buffer
DBF2
DBF1
DBF0
Note
b0
b1
b2
b3
b0
b1
b2
b3
b0
b1
b2
b3
b0
b1
b2
b3
b0
b1
b2
b3
b0
b1
b2
b3
b0
b1
b2
b3
b0
b1
b2
b3



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