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UPD17072 bảng dữ liệu(PDF) 23 Page - NEC

tên linh kiện UPD17072
Giải thích chi tiết về linh kiện  4-BIT SINGLE-CHIP MICROCONTROLLER WITH HARDWARE FOR DIGITAL TUNING SYSTEM
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UPD17072 bảng dữ liệu(HTML) 23 Page - NEC

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µPD17072,17073
3.
ADDRESS STACK (ASK)
3.1 General
Figure 3-1 outlines the address stack.
The address stack consists of a stack pointer and an address stack register.
The address of the address stack register is specified by the stack pointer.
The address stack saves return addresses when a subroutine call instruction has been executed and when an
interrupt has been accepted.
The address stack is also used when a table reference instruction is executed.
Figure 3-1. Outline of Address Stack
3.2 Address Stack Register (ASR)
Figure 3-2 shows the configuration of the address stack register.
The address stack register consists of three 12-bit registers ASR0-ASR2. Actually, however, no register is
assigned to ASR2, and the address stack register therefore consists of two 12-bit registers (ASR0 and ASR1).
The address stack saves return addresses when a subroutine call instruction has been executed, when an interrupt
has been accepted, and when a table reference instruction is executed.
Figure 3-2. Configuration of Address Stack Register
Stack pointer
Address stack register
Return address
Specifies address
Address stack register (ASR)
Stack pointer
(SP)
Bit
Bit
Address
0H
1H
2H
ASR0
ASR1
ASR2 (Undefined)
Cannot
be used
b3
b2
b1
b0
0
0
SP1 SP0
b11
b10
b9
b8
b7
b6
b5
b4
b3
b2
b1
b0



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