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| 型号： | EVAL-ADUC842QS |
| 厂商： | Analog Devices Inc |
| 文件页数： | 42/88页 |
| 文件大小： | 0K |
| 描述： | KIT DEV FOR ADUC842 QUICK START |
| 标准包装： | 1 |
| 系列： | QuickStart™ 套件 |
| 类型： | MCU |
| 适用于相关产品： | ADuC842 |
| 所含物品： | 评估板、电源、缆线、软件和说明文档 |
| 产品目录页面： | 739 (CN2011-ZH PDF) |
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ADuC841/ADuC842/ADuC843
Rev. 0 | Page 47 of 88
Using the SPI Interface
Depending on the configuration of the bits in the SPICON SFR
shown in Table 18, the ADuC841/ADuC842/ADuC843 SPI
interface transmits or receives data in a number of possible
modes. Figure 54 shows all possible SPI configurations for the
parts, and the timing relationships and synchronization
between the signals involved. Also shown in this figure is the
SPI interrupt bit (ISPI) and how it is triggered at the end of each
byte-wide communication.
SCLOCK
(CPOL = 1)
SCLOCK
(CPOL = 0)
(CPHA = 1)
(CPHA = 0)
SAMPLE INPUT
ISPI FLAG
DATA OUTPUT
ISPI FLAG
SAMPLE INPUT
DATA OUTPUT
?
MSB BIT 6 BIT 5
?
BIT 4 BIT 3 BIT 2 BIT 1 LSB
MSB BIT 6 BIT 5 BIT 4 BIT 3 BIT 2 BIT 1 LSB
SS
03260-
0-
053
Figure 54. SPI Timing, All Modes
SPI Interface—Master Mode
In master mode, the SCLOCK pin is always an output and
generates a burst of eight clocks whenever user code writes to
the SPIDAT register. The SCLOCK bit rate is determined by
SPR0 and SPR1 in SPICON. Also note that the SS pin is not
used in master mode. If the parts need to assert the SS pin on an
external slave device, a port digital output pin should be used.
In master mode, a byte transmission or reception is initiated by
a write to SPIDAT. Eight clock periods are generated via the
SCLOCK pin and the SPIDAT byte being transmitted via MOSI.
With each SCLOCK period, a data bit is also sampled via MISO.
After eight clocks, the transmitted byte will be completely
transmitted, and the input byte will be waiting in the input shift
register. The ISPI flag will be set automatically, and an interrupt
will occur if enabled. The value in the shift register will be
latched into SPIDAT.
SPI Interface—Slave Mode
In slave mode, SCLOCK is an input. The SS pin must also be
driven low externally during the byte communication. Trans-
mission is also initiated by a write to SPIDAT. In slave mode, a
data bit is transmitted via MISO, and a data bit is received via
MOSI through each input SCLOCK period. After eight clocks,
the transmitted byte will be completely transmitted, and the
input byte will be waiting in the input shift register. The ISPI
flag will be set automatically, and an interrupt will occur if
enabled. The value in the shift register will be latched into
SPIDAT only when the transmission/reception of a byte has
been completed. The end of transmission occurs after the
eighth clock has been received if CPHA = 1, or when SS returns
high if CPHA = 0.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-ADUC842QS1 | 制造商:AD 制造商全称:Analog Devices 功能描述:MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| EVAL-ADUC842QSP1 | 制造商:AD 制造商全称:Analog Devices 功能描述:MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| EVAL-ADUC842QSP2 | 制造商:AD 制造商全称:Analog Devices 功能描述:MicroConverter 12-Bit ADCs and DACs with Embedded High Speed 62-kB Flash MCU |
| EVAL-ADUC842QSPZ | 功能描述:KIT DEV QUICK START ADUC842 RoHS:是 类别:编程器，开发系统 >> 通用嵌入式开发板和套件（MCU、DSP、FPGA、CPLD等） 系列:QuickStart™ PLUS 套件 标准包装:1 系列:PICDEM™ 类型:MCU 适用于相关产品:PIC10F206，PIC16F690，PIC16F819 所含物品:板，线缆，元件，CD，PICkit 编程器 产品目录页面:659 (CN2011-ZH PDF) |
| EVAL-ADUC842QS-U | 制造商:Analog Devices 功能描述:TOOLS:DEVELOPMENT BOARDS H/W 制造商:Analog Devices 功能描述:QUICK START DEVELOPMENT SYSTEM - Bulk |
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