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UPD17P136ACT bảng dữ liệu(PDF) 36 Page - NEC

tên linh kiện UPD17P136ACT
Giải thích chi tiết về linh kiện  4-BIT SINGLE-CHIP MICROCONTROLLER
PDF  292 Pages
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nhà sản xuất  NEC [NEC]
Trang chủ  http://www.nec.com/
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UPD17P136ACT bảng dữ liệu(HTML) 36 Page - NEC

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CHAPTER 3
PROGRAM COUNTER (PC)
The program counter is used to specify an address in program memory.
3.1 PROGRAM COUNTER CONFIGURATION
Figure 3-1 shows the configuration of the program counter.
The program counters of the
µPD17134A and µPD17135A are 10-bit binary counters.
The program counters of the
µPD17136A, µPD17137A, µPD17P136A, and µPD17P137A are 11-bit binary
counters.
This program counter is incremented whenever an instruction is executed.
Figure 3-1. Program Counter
Remark The shaded part is effective only in the case of
µPD17136A/17137A/17P136A/17P137A.
3.2 PROGRAM COUNTER OPERATION
Normally, the program counter is automatically incremented each time a command is executed. The memory
address at which the next instruction to be executed is stored is assigned to the program counter under the following
conditions: At reset; when a branch, subroutine call, return, or table reference instruction is executed; or when an
interrupt is received.
3.2.1 to 3.2.7 explain program counter operation during execution of each instruction.
PC
PC9
PC8
PC7
PC6
PC5
PC4
PC3
PC2
PC1
PC0
MSB
LSB
PC10
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