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參數(shù)資料
| 型號： | CY7C63742-SC |
| 廠商： | CYPRESS SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, OTPROM, 12 MHz, RISC MICROCONTROLLER, PDSO24 |
| 封裝： | 0.300 INCH, PLASTIC, SOIC-24 |
| 文件頁數(shù)： | 48/48頁 |
| 文件大?。?/td> | 425K |
| 代理商： | CY7C63742-SC |
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PRELIMINARY
FO R
enCoRe USB CY7C63722/23
CY7C63742/43
9
For USB applications, the firmware should set the DSP to an appropriate location to avoid a memory conflict with RAM dedicated
to USB FIFOs. The memory requirements for the USB endpoints are shown in Section 8.2. For example, assembly instructions
to set the DSP to 20h (giving 32 bytes for program and data stack combined) are shown below:
MOV A,20h
; Move 20 hex into Accumulator (must be D8h or less to avoid USB FIFOs)
SWAP A,DSP ; swap accumulator value into DSP register
6.6
Address Modes
The CY7C637xx microcontrollers support three addressing modes for instructions that require data operands: data, direct, and
indexed.
6.6.1
Data
The “Data” address mode refers to a data operand that is actually a constant encoded in the instruction. As an example, consider
the instruction that loads A with the constant 0x30:
MOV A, 30h
This instruction will require two bytes of code where the first byte identifies the “MOV A” instruction with a data operand as the
second byte. The second byte of the instruction will be the constant “0xE8h”. A constant may be referred to by name if a prior
“EQU” statement assigns the constant value to the name. For example, the following code is equivalent to the example shown
above:
DSPINIT: EQU 30h
MOV A,DSPINIT
6.6.2
Direct
“Direct” address mode is used when the data operand is a variable stored in SRAM. In that case, the one byte address of the
variable is encoded in the instruction. As an example, consider an instruction that loads A with the contents of memory address
location 0x10h:
MOV A, [10h]
In normal usage, variable names are assigned to variable addresses using “EQU” statements to improve the readability of the
assembler source code. As an example, the following code is equivalent to the example shown above:
buttons: EQU 10h
MOV A,[buttons]
6.6.3
Indexed
“Indexed” address mode allows the firmware to manipulate arrays of data stored in SRAM. The address of the data operand is
the sum of a constant encoded in the instruction and the contents of the “X” register. In normal usage, the constant will be the
“base” address of an array of data and the X register will contain an index that indicates which element of the array is actually
addressed:
array: EQU 10h
MOV X,3
MOV A,[x+array]
This would have the effect of loading A with the fourth element of the SRAM “array” that begins at address 0x10h. The fourth
element would be at address 0x13h.
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