參數資料
型號: HD404668
廠商: Hitachi,Ltd.
英文描述: Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機)
中文描述: 低電壓如同在微機芯片的DTMF產生電路(帶雙音多頻電路的低電壓微計算機)
文件頁數: 17/142頁
文件大?。?/td> 894K
代理商: HD404668
HD404669 Series
17
Data Area ($090–$2EF):
464 digits from $090 to $25F have two banks, which can be selected by setting
the bank register (V: $03F). Before accessing this area, set the bank register to the required value (figure
7). The area from $026 to $2EF is accessed without setting the bank register.
Bit
Initial value
Read/Write
Bit name
3
Not used
2
Not used
0
0
R/W
V0
1
Not used
V0
0
1
Bank area selection
Bank 0 is selected
Bank 1 is selected
Note: After reset, the value in the bank register is 0, and therefore bank 0 is
selected.
Bank register (V: $03F)
Figure 7 Bank Register (V)
Stack Area ($3C0–$3FF):
Used for saving the contents of the program counter (PC), status flag (ST), and
carry flag (CA) at subroutine call (CAL or CALL instruction) and for interrupts. This area can be used as a
16-level nesting subroutine stack in which one level requires four digits. The data to be saved and the save
conditions are shown in figure 6.
The program counter is restored by either the RTN or RTNI instruction, but the status and carry flags can
only be restored by the RTNI instruction. Any unused space in this area is used for data storage.
相關PDF資料
PDF描述
HD404669 Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機)
HD407A4669 Low-Voltage AS Microcomputers with On-Chip DTMF Generation Circuit(帶雙音多頻電路的低電壓微計算機)
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HD404669SERIES 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
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