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參數(shù)資料
| 型號(hào)： | HD404459 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 4-bit HMCS400-Series microcomputer(4位單片微計(jì)算機(jī)) |
| 中文描述： | 4位HMCS400系列微機(jī)（4位單片微計(jì)算機(jī)） |
| 文件頁數(shù)： | 105/120頁 |
| 文件大小： | 692K |
| 代理商： | HD404459 |
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HD404459 Series
105
ROM Addressing Modes and the P Instruction
The MCU has four ROM addressing modes (figure 85).
Direct Addressing Mode:
A program can branch to any address in ROM memory space by executing the
JMPL, BRL, or CALL instruction. Each of these instructions replaces the 14 program counter bits (PC
13
–
PC
0
) with 14-bit immediate data.
Current Page Addressing Mode:
The MCU has 64 pages of ROM with 256 words per page. A program
can branch to any address in the current page by executing the BR instruction. This instruction replaces the
eight low-order bits of the program counter (PC
7
–PC
0
) with eight-bit immediate data. If the BR instruction
is on a page boundary (address 256n + 255), executing that instruction transfers the PC contents to the next
physical page (figure 87). This means that the execution of the BR instruction on a page boundary will
make the program branch to the next page.
Note that the HMCS400-series cross macroassembler has an automatic paging feature for ROM pages.
Zero-Page Addressing Mode:
A program can branch to the zero-page subroutine area located at $0000–
$003F by executing the CAL instruction. When the CAL instruction is executed, 6 bits of immediate data
are placed in the six low-order bits of the program counter (PC
5
–PC
0
), and 0s are placed in the eight high-
order bits (PC
13
–PC
6
).
Table Data Addressing Mode:
A program can branch to an address determined by the contents of four-bit
immediate data, the accumulator, and the B register by executing the TBR instruction.
P Instruction:
ROM data addressed in table data addressing mode can be referenced with the P instruction
(figure 86). If bit 8 of the ROM data is 1, eight bits of ROM data are written to the accumulator and the B
register. If bit 9 is 1, eight bits of ROM data are written to the R1 and R2 port output registers. If both bits 8
and 9 are 1, ROM data is written to the accumulator and the B register, and also to the R1 and R2 port
output registers at the same time.
The P instruction has no effect on the program counter.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| HD404459H | 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:4-bit HMCS400-series microcomputers |
| HD404459SERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述: |
| HD404508FS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| HD404608FS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
| HD404608H | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:4-Bit Microcontroller |
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