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參數資料
| 型號： | FM8P51EF |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | EPROM/ROM-Based 8-Bit Microcontroller |
| 中文描述： | 存儲器/基于ROM的8位微控制器 |
| 文件頁數： | 8/60頁 |
| 文件大小： | 369K |
| 代理商： | FM8P51EF |
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FM8P51
Rev1.2 Mar 15, 2005
P.8/FM8P51
FEELING
TECHNOLOGY
2.0 FUNCTIONAL DESCRIPTIONS
2.1 Operational Registers
2.1.1 INDF (Indirect Addressing Register)
Address
Name
00h (r/w)
INDF
The INDF Register is not a physical register. Any instruction accessing the INDF register can actually access the
register pointed by FSR Register. Reading the INDF register itself indirectly (FSR=”0”) will read 00h. Writing to the
INDF register indirectly results in a no-operation (although status bits may be affected).
The bits 5-0 of FSR register are used to select up to 64 registers (address: 00h ~ 3Fh).
In FM8P51 series, the data memory is partitioned into four banks. Switching between these banks requires the RP1
and RP0 bits in the FSR register to be configured for the desired bank. The lower locations of each bank are
reserved for the Special Function Registers. Above the Special Function Registers are General Purpose Registers.
All Special Function Registers and some of General Purpose Registers from other banks are mirrored in bank 0 for
code reduction and quicker access.
Accessed
Bank
0
0 0
1
0 1
2
1 0
3
1 1
EXAMPLE 2.1: INDIRECT ADDRESSING
Register file 38 contains the value 10h
Register file 39 contains the value 0Ah
Load the value 38 into the FSR Register
A read of the INDF Register will return the value of 10h
Increment the value of the FSR Register by one (@FSR=39h)
A read of the INDR register now will return the value of 0Ah.
FIGURE 2.1: Direct/Indirect Addressing for FM8P51 Series
Direct Addressing
RP1:RP0
5
from opcode
0
0 0
0 1
location select
00h
3Fh
B7
B6
B5
B4
B3
B2
B1
B0
Uses contents of FSR to address data memory (not a physical register)
RP1:RP0
Indirect Addressing
5 from FSR register 0
1 1
1 0
location select
addressing INDF register
bank select
相關PDF資料 |
PDF描述 |
|---|---|
| FM8P51EP | EPROM/ROM-Based 8-Bit Microcontroller |
| FM8P51F | EPROM/ROM-Based 8-Bit Microcontroller |
| FM8P51P | EPROM/ROM-Based 8-Bit Microcontroller |
| FM8P51E | EPROM/ROM-Based 8-Bit Microcontroller |
| FM8P54 | EPROM/ROM-Based 8-Bit Microcontroller Series |
相關代理商/技術參數 |
參數描述 |
|---|---|
| FM8P51EP | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EPROM/ROM-Based 8-Bit Microcontroller |
| FM8P51F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EPROM/ROM-Based 8-Bit Microcontroller |
| FM8P51P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EPROM/ROM-Based 8-Bit Microcontroller |
| FM8P54 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EPROM/ROM-Based 8-Bit Microcontroller Series |
| FM8P54E | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EPROM/ROM-Based 8-Bit Microcontroller Series |
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