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UPD17P136ACT 데이터시트(PDF) 37 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) 37 Page - NEC

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CHAPTER 3 PROGRAM COUNTER (PC)
18
Figure 3-2. Value of the Program Counter after Instruction Execution
Remark The shaded part is effective only in the case of
µPD17136A/17137A/17P136A/17P137A.
3.2.1 At Reset
By setting the RESET pin to low, the program counter is set to 0000H.
Figure 3-3. Value in the Program Counter after Reset
Remark The shaded part is effective only in the case of
µPD17136A/17137A/17P136A/17P137A.
3.2.2 During Execution of the Branch Instruction (BR)
There are two ways to specify branching using the branch instruction. One is to specify the branch address in the
operand using the direct branch instruction (BR addr). The other is branch to the address specified by the address
register using the indirect branch instruction (BR @AR).
The address specified by a BR addr instruction is placed in the program counter.
Figure 3-4. Value in the Program Counter during Execution of a BR addr Instruction
Remark The shaded part is effective only in the case of
µPD17136A/17137A/17P136A/17P137A.
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
000
0
0
0
0
00
0
At reset
BR addr
CALL addr
BR @AR
CALL @AR
(MOVT DBF, @AR)
RET
RETSK
RETI
During interrupt
Value in the address register (AR)
Value set by the addr
Value in the address stack register location pointed to by the stack pointer
(return address)
Vector address for the interrupt
Program counter value
Program counter
bit
Instruction
PC10
0
0
MSB
LSB
0
00000000
All bits are set to 0
0
PC10
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
MSB
LSB
Value specified in the direct branch instruction
PC9



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