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型號：	MQ80C52CXXX-36SBR
廠商：	TEMIC SEMICONDUCTORS
元件分類：	微控制器/微處理器
英文描述：	8-BIT, MROM, 36 MHz, MICROCONTROLLER, CQFP44
文件頁數(shù)：	853/1447頁
文件大?。?/td>	3788K
代理商：	MQ80C52CXXX-36SBR

6437E–ATARM–23-Apr-13

ever the SPI still controls the number of bits (8 to16) to be transferred through MISO and MOSI

lines with the chip select configuration registers. This is not the optimal means in term of mem-

ory size for the buffers, but it provides a very effective means to exchange data with several

peripherals without any intervention of the processor.

Transfer Size

Depending on the data size to transmit, from 8 to 16 bits, the PDC manages automatically the

type of pointer's size it has to point to. The PDC will perform the following transfer size depend-

ing on the mode and number of bits per data.

Byte transfer,

PDC Pointer Address = Address + 1 byte,

PDC Counter = Counter - 1

8-bit to 16-bit Data:

2 bytes transfer. n-bit data transfer with don’t care data (MSB) filled with 0’s,

PDC Pointer Address = Address + 2 bytes,

PDC Counter = Counter - 1

Variable Mode:

In variable Mode, PDC Pointer Address = Address +4 bytes and PDC Counter = Counter - 1 for

8 to 16-bit transfer size. When using the PDC, the TDRE and RDRF flags are handled by the

PDC, thus the user’s application does not have to check those bits. Only End of RX Buffer

(ENDRX), End of TX Buffer (ENDTX), Buffer Full (RXBUFF), TX Buffer Empty (TXBUFE) are

significant. For further details about the Peripheral DMA Controller and user interface, refer to

the PDC section of the product datasheet.

SPI Direct Access Memory Controller (DMAC)

In both fixed and variable mode the Direct Memory Access Controller (DMAC) can be used to

reduce processor overhead.

The Fixed Peripheral Selection allows buffer transfers with a single peripheral. Using the DMAC

is an optimal means, as the size of the data transfer between the memory and the SPI is either 8

bits or 16 bits. However, changing the peripheral selection requires the Mode Register to be

reprogrammed.

The Variable Peripheral Selection allows buffer transfers with multiple peripherals without repro-

gramming the Mode Register. Data written in SPI_TDR is 32 bits wide and defines the real data

to be transmitted and the peripheral it is destined to. Using the DMAC in this mode requires 32-

bit wide buffers, with the data in the LSBs and the PCS and LASTXFER fields in the MSBs, how-

ever the SPI still controls the number of bits (8 to16) to be transferred through MISO and MOSI

lines with the chip select configuration registers. This is not the optimal means in term of mem-

ory size for the buffers, but it provides a very effective means to exchange data with several

peripherals without any intervention of the processor.

相關PDF資料	PDF描述
MT80C31-25R	8-BIT, 25 MHz, MICROCONTROLLER, PQFP44
MQ80C52TXXX-16/883	8-BIT, MROM, 16 MHz, MICROCONTROLLER, CQFP44
MR80C52EXXX-20SCD	8-BIT, MROM, 20 MHz, MICROCONTROLLER, CQCC44
MR80C32-16SHXXX	8-BIT, 16 MHz, MICROCONTROLLER, CQCC44
MD80C32EXXX-30/883	8-BIT, 30 MHz, MICROCONTROLLER, CDIP40

相關代理商/技術(shù)參數(shù)	參數(shù)描述
MQ82370-20	制造商:Rochester Electronics LLC 功能描述:- Bulk
MQ8238020	制造商:Intel 功能描述:CONTROLLER: OTHER
MQ82380-20	制造商:Rochester Electronics LLC 功能描述:- Bulk
MQ82380-20/R	制造商:Rochester Electronics LLC 功能描述:
MQ82592	制造商:Rochester Electronics LLC 功能描述:- Bulk

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