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參數資料
型號: FMS7401LVN14
廠商: FAIRCHILD SEMICONDUCTOR CORP
元件分類: 微控制器/微處理器
英文描述: Digital Power Controller
中文描述: 8-BIT, EEPROM, 2.04 MHz, MICROCONTROLLER, PDIP14
封裝: PLASTIC, DIP-14
文件頁數: 47/80頁
文件大小: 1535K
代理商: FMS7401LVN14
PRODUCT SPECIFICATION
FMS7401/7401L
REV. 1.0.2 6/23/04
47
10 8-Bit Microcontroller Core
The FMS7401/7401L’s 8-bit microcontroller core is specifically designed for low cost applications involving bit manipulation,
shifting and block encryption. It is based on a modified Harvard architecture meaning peripheral, I/O and RAM locations are
addressed separately from instruction data.
The core differs from the traditional Harvard architecture by aligning the data and instruction memory sequentially. This
allows the X-pointer (11-bits) to point to any memory location in either segment of the memory map. This modification
improves the overall code efficiency of the microcontroller core and takes advantage of the flexibility found on the von Neu-
mann architecture and stored program concept.
10.1 Core Registers
The microcontroller core has five general-purpose registers. These registers are the Accumulator (A), X-Pointer (X), Program
Counter (PC), Stack Pointer (SP) and Status Register (SR). The X, SP and SR registers are memory mapped while A and PC
are not.
Figure 17. Core Program Model
NEGATIVE flag
HALF CARRY flag
GLOBAL INTERRUPT enable
READY flag
ZERO flag
CARRY flag
0
7
0
0
0
3
9
10
0
0
N
H
C
Z
G
R
A
X
PC
SP
SR
8-bit accumulator register
4-bit stack pointer
8-bit status register
10-bit program counter
11-bit X pointer register
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相關代理商/技術參數
參數描述
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