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| 型号： | TOOLSTICK530ADC |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 214/220页 |
| 文件大小： | 0K |
| 描述： | DAUGHTR CARD TOOLSTICK C8051F530 |
| 标准包装： | 1 |
| 系列： | ToolStick |
| 类型： | MCU |
| 适用于相关产品： | C8051F530A |
| 所含物品： | 板 |
| 产品目录页面： | 626 (CN2011-ZH PDF) |
| 配用： | 336-1345-ND - TOOLSTICK BASE ADAPTER 336-1182-ND - ADAPTER USB DEBUG FOR C8051FXXX |
| 相关产品： | 336-1486-5-ND - IC 8051 MCU 8K FLASH 20TSSOP 336-1485-5-ND - IC 8051 MCU 8K FLASH 20QFN |
| 其它名称： | 336-1487 |
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Rev. 1.4
93
C8051F52x/F53x
9.2. Data Memory
The C8051F52x/F52xA/F53x/F53xAincludes 256 bytes of internal RAM mapped into the data memory
space from 0x00 through 0xFF. The lower 128 bytes of data memory are used for general purpose regis-
ters and scratch pad memory. Either direct or indirect addressing may be used to access the lower
128 bytes of data memory. Locations 0x00 through 0x1F are addressable as four banks of general pur-
pose registers, each bank consisting of eight byte-wide registers. The next 16 bytes, locations 0x20
through 0x2F, may either be addressed as bytes or as 128 bit locations accessible with the direct address-
ing mode.
The upper 128 bytes of data memory are accessible only by indirect addressing. This region occupies the
same address space as the Special Function Registers (SFRs) but is physically separate from the SFR
space. The addressing mode used by an instruction when accessing locations above 0x7F determines
whether the CPU accesses the upper 128 bytes of data memory space or the SFRs. Instructions that use
direct addressing will access the SFR space. Instructions using indirect addressing above 0x7F access the
upper 128 bytes of data memory. Figure 9.1 illustrates the data memory organization of the C8051F52x/
F52xA/F53x/F53xA.
9.3. General Purpose Registers
The lower 32 bytes of data memory (locations 0x00 through 0x1F) may be addressed as four banks of
general-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 8.4. PSW: Pro-
gram Status Word). This allows fast context switching when entering subroutines and interrupt service rou-
tines. Indirect addressing modes use registers R0 and R1 as index registers.
9.4. 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, 22.3h
moves the Boolean value at 0x13 (bit 3 of the byte at location 0x22) into the Carry flag.
9.5. Stack
A programmer's stack can be located anywhere in the 256-byte data memory. The stack area is desig-
nated using the Stack Pointer (SP, 0x81) SFR. The SP will point to the last location used. The next value
pushed on the stack is placed at SP+1 and then SP is incremented. A reset initializes the stack pointer to
location 0x07. Therefore, the first value pushed on the stack is placed at location 0x08, which is also the
first register (R0) of register bank 1. Thus, if more than one register bank is to be used, the SP should be
initialized to a location in the data memory not being used for data storage. The stack depth can extend up
to 256 bytes.
9.6. Special Function Registers
The direct-access data memory locations from 0x80 to 0xFF constitute the special function registers
(SFRs). The SFRs provide control and data exchange with the CIP-51's resources and peripherals. The
CIP-51 duplicates the SFRs found in a typical 8051 implementation as well as implementing additional
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