參數(shù)資料
型號: C8051F2XX
廠商: Electronic Theatre Controls, Inc.
英文描述: Mixed Signal 8 kB ISP Flash MCU Family
中文描述: 混合信號8 KB的閃存MCU系列的ISP
文件頁數(shù): 66/146頁
文件大?。?/td> 1856K
代理商: C8051F2XX
C8051F2xx
66
Rev. 1.6
Figure 9.2. Memory Map
9.2.3. General Purpose Registers
The lower 32 bytes of data memory, locations 0x00 through 0x1F, may be addressed as four banks of gen-
eral-purpose registers. Each bank consists of eight byte-wide registers designated R0 through R7. Only
one of these banks may be enabled at a time. Two bits in the program status word, RS0 (PSW.3) and RS1
(PSW.4), select the active register bank (see description of the PSW in SFR Definition 9.4). This allows
fast context switching when entering subroutines and interrupt service routines. Indirect addressing
modes use registers R0 and R1 as index registers.
9.2.4. Bit Addressable Locations
In addition to direct access to data memory organized as bytes, the sixteen data memory locations at 0x20
through 0x2F are also accessible as 128 individually addressable bits. Each bit has a bit address from
0x00 to 0x7F. Bit 0 of the byte at 0x20 has bit address 0x00 while bit 7 of the byte at 0x20 has bit address
0x07. Bit 7 of the byte at 0x2F has bit address 0x7F. A bit access is distinguished from a full byte access
by the type of instruction used (bit source or destination operands as opposed to a byte source or destina-
tion).
The MCS-51 assembly language allows an alternate notation for bit addressing of the form XX.B where
XX is the byte address and B is the bit position within the byte. For example, the instruction:
MOV
C, 22h.3
moves the Boolean value at 0x13 (bit 3 of the byte at location 0x22) into the user Carry flag.
FLASH
(In-System
Programmable in 512
Byte Sectors)
PROGRAM MEMORY
0x0000
0x1FFF
0x1E00
0x1DFF
(Direct and Indirect
Addressing)
0x00
0x7F
Upper 128 RAM
(Indirect Addressing
Only)
0x80
0xFF
Special Function
Register's
(Direct Addressing Only)
RESERVED
128 Byte ISP FLASH
0x2000
0x207F
DATA MEMORY
General Purpose
Registers
0x1F
0x20
0x2F
Bit Addressable
Lower 128 RAM
(Direct and Indirect
Addressing)
0x30
1024 Byte
XRAM
0x3FF
0x000
Mapped into
External Data Memory
Space
(C8051F226/236/206 only)
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